Morphogen-induced periodontal tissue regeneration

ABSTRACT

Disclosed are methods and compositions for inducing periodontal tissue morphogenesis in a mammal which include a therapeutically effective concentration of a morphogen. The methods and compositions are useful for integrating an implanted tooth in a tooth socket and for inhibiting tissue loss associated with periodontal disease or injury.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. Ser. No. 08/155,343, filed Nov. 15, 1993, now U.S. Pat. No. 5,656,593, which is a continuation of U.S. Ser. No. 07/945,285, filed Sep. 15, 1992, now abandoned which is a continuation-in-part of (1) U.S. Ser. No. 07/938,336, filed Aug. 28, 1992, now abandoned, and U.S. Ser. No. 07/938,337, now abandoned, filed Aug. 28, 1992 and U.S. Ser. No. 07/753,059, filed Aug. 30, 1991, now abandoned, which is a continuation-in-part of U.S. Ser. No. 07/667,274, filed Mar. 11, 1991, now abandoned, and (2) U.S. Ser. No. 07/752,764, filed Aug. 30, 1991, now abandoned, which is a continuation-in-part of U.S. Ser. No. 07/667,274, filed Aug. 11, 1991, now abandoned. The disclosures of these applications are incorporated herein by reference.

BACKGROUND OF THE INVENTION

This invention relates generally to the dental arts and more specifically to methods and compositions for treating and regenerating periodontal tissue.

The peridontium is the cushioning tissue which anchors the tooth root to the mandibular or maxillar jawbone tissue by suspending the tooth in the tooth socket ("alveolus"). Periodontal tissue includes both the periodontal ligament, a collagen-containing tissue that is in contact with the bone tissue, and cementum, a mineralized tissue that covers the dental root surface. These two hard tissues are connected through the periodontal ligament fibers that run in a perpendicular direction to the two surfaces and thereby serve to anchor and suspend the tooth in the tooth socket, providing a shock-absorptive cushion between the tooth and the jawbone that accommodates the pressure applied to teeth when food is being chewed.

Periodontal tissue loss may occur as a result of disease, including infectious diseases (e.g., gingivitis, caused by bacteria), nutritional diseases, e.g., scurvy, resulting from a vitamin deficiency, and a number of neoplastic diseases, including acute leukemia and lymphomas. The diseases are characterized by inflammation, bleeding and ulceration. Periodontal disease also may result from an opportunistic infection, e.g., in an immune-compromised individual. Left untreated, these diseases can cause significant periodontal tissue loss which loosen the tooth and ultimately can result in loss of the tooth and the alveolar bone tissue (periodontitis.) Chronic periodontitis is the primary cause of tooth loss in adults. Current treatments include professional cleaning to remove plaque and tartar, use of oral antiseptics, local and/or systemic antibiotic therapies, and/or surgical procedures to remove periodontal pockets formed from periodontal tissue lesions and necrosis. Typically, where a tooth has been lost as a result of periodontitis, a prosthetic tooth or removable bridge is substituted for the natural tooth.

Periodontal tissue loss also may occur as a result of mechanical injury to the tissue or to the tooth itself, particularly one causing tooth loss. Tooth loss also may occur as a result of any of a number of dental diseases, e.g., dental caries, pulpitis, or osteomyelitis.

A viable tooth can be reimplanted if implantation occurs quickly after loss, e.g. , within thirty minutes, and if the periodontal tissue within the tooth socket is still healthy. However, if a significant period of time is allowed to elapse, the living periodontal tissue lining the tooth socket will be resorbed. In addition, the tooth itself begins to degenerate and a prosthetic tooth or removable bridge must be implanted. In the absence of healthy periodontal tissue the prosthetic implant is integrated directly into the jaw bone tissue in a condition called ankylosis (bone tissue in direct contact with dentin tissue.) The life of such prosthetic tooth implants often is limited due to the absence of viable periodontal tissue to enhance tooth anchoring and to absorb the impact of mastication on the prosthesis.

It is an object of this invention to provide a means for inhibiting periodontal tissue loss, as well as means for inducing regeneration of damaged periodontal tissue. Another object is to provide means for inhibiting the periodontal tissue damage and tooth loss associated with periodontal and other gum diseases. Yet another object is to enhance integration of an implanted tooth, including a reimplanted natural tooth or tooth prosthesis, in the tooth socket. Still another object is to promote periodontal tissue growth around an implanted tooth. Another object is to inhibit ankylosis of an implanted tooth or tooth prosthesis.

These and other objects and features of the invention will be obvious from the specification, drawings and claims, which follow.

SUMMARY OF THE INVENTION

The invention provides methods and compositions for inhibiting periodontal tissue loss in a mammal, particularly humans, including regenerating damaged tissue and/or inhibiting additional damage thereto. The methods and compositions of this invention may be used to prevent and/or inhibit tooth loss, as well as to enhance integration of an implanted tooth.

As used herein, "implanted tooth" includes a natural tooth which has grown naturally in the tooth socket, a natural tooth which is reimplanted in a tooth socket, and a prosthetic tooth, which includes both natural teeth from which the root has been removed and replaced with an inert, biocompatible material, and "complete" prostheses made of natural or synthetic, non dentin-containing materials. In all cases, "tooth" refers to a natural or synthetic composition essentially defining the shape of a natural tooth, having a solid tooth body, including a crown and tooth root. "Reimplanted natural tooth" includes both an allogenic tooth, e.g., selected from a tooth bank; and a tooth autologous to the mammal, such as a tooth which has fallen out, been knocked out, or otherwise removed from the individual into which it is now being reimplanted. "Integrated tooth" means an implanted tooth with a living, substantially healthy periodontal tissue, including periodontal ligament and cementum, anchoring the tooth to the jaw bone. "Viable" tissue means living, substantially healthy tissue. "Viable tooth" refers to an implanted natural tooth with a living tooth root. "Periodontium" defines the tissues which surround the tooth in the tooth socket and includes both periodontal ligament and cementum. "Inhibit loss" of periodontal tissue, as used herein, means inhibiting damage to, and/or loss of, periodontal tissue, including periodontal ligament and/or cementum, and includes regenerating lost or damaged tissue and/or inhibiting additional damage thereto. "Symptom alleviating cofactor" refers to one or more pharmaceuticals which may be administered together with the therapeutic agents of this invention and which alleviate or mitigate one or more of the symptoms typically associated with periodontal tissue loss. Exemplary cofactors include antibiotics, antiseptics, non-steroidal antiinflammatory agents, anaesthetics and analgesics.

The methods and compositions of this invention include a morphogenic protein ("morphogen"), as described herein, which, when provided to the tooth and/or jawbone surfaces in a tooth socket is capable of inducing periodontal tissue formation where periodontal tissue has been lost or damaged, and enhancing integration of an implanted tooth thereby.

In one aspect, the invention features therapeutic treatment methods and compositions for inhibiting periodontal tissue loss in a mammal which include administering to the individual a therapeutically effective morphogen concentration and for a time sufficient to regenerate damaged periodontal tissue and/or to inhibit additional damage thereto.

In another aspect, the invention features therapeutic treatment methods and compositions for inhibiting periodontal tissue loss in a mammal which include administering to the individual a compound that stimulates in vivo a therapeutically effective concentration of an endogenous morphogen in the body of the mammal sufficient to regenerate damaged periodontal tissue and/or to inhibit additional damage thereto. These compounds are referred to herein as morphogen-stimulating agents, and are understood to include substances which, when administered to a mammal, act on cells of tissue(s) or organ(s) that normally are responsible for, or capable of, producing a morphogen and/or secreting a morphogen, and which cause the endogenous level of the morphogen to be altered. The agent may act, for example, by stimulating expression and/or secretion of an endogenous morphogen. In preferred embodiments, the agent stimulates expression and/or secretion of an endogenous morphogen so as to increase amounts of the morphogen in the alveolar bone, periodontium or cementum tissue cells.

In another aspect, the invention provides methods and compositions for enhancing the integration of an implanted tooth, particularly where the tooth socket is substantially reduced in viable periodontal tissue. In fact, the processes and compositions of the invention work well when a tooth socket has lost 30-50% of the periodontal ligament, and as much as 50-100% of the periodontal ligament. The methods and compositions include providing to the tooth or tooth socket surface a therapeutically effective concentration of a morphogen or morphogen-stimulating agent sufficient to induce morphogenesis of periodontal tissue. The implanted tooth may be an implanted tooth which has grown naturally in the socket and which is loose as a result of, for example, mechanical injury or due to a dental or periodontal disease. Alternatively, the implanted tooth may be a lost tooth or a tooth prosthesis which has been reimplanted in a vacant tooth socket. The tooth prosthesis may include a natural tooth from which a damaged or diseased root has been removed and replaced with a biocompatible, biologically inert material, as is created in a root canal procedure. The prosthetic tooth also may be composed of synthetic, non dentin-containing materials.

The morphogen may be provided directly to the tooth surface to be implanted, and/or to the tooth socket to which the tooth is to be implanted. Where the morphogen is to be provided to the tissue socket, it may be provided by topical administration to the tooth socket surface or by local injection to periodontal or alveolar bone tissue associated with the socket. Alternatively, an agent capable of stimulating the production and/or secretion of a therapeutically effective concentration of an endogenous morphogen also may be provided to the tooth or tooth socket. Where the morphogen or morphogen stimulating agent (referred to herein collectively as "therapeutic agent") is provided to the tooth surface, it preferably is dispersed in a biocompatible, bioresorbable carrier, most preferably a carrier capable of retaining the therapeutic agent at the tissue surface and/or providing a controlled delivery of the agent to the tooth socket. The therapeutic agent also may be provided to the tooth socket itself, also preferably in association with a carrier capable of maintaining the agent in the tooth socket, and/or capable of enhancing the controlled delivery of the agent to the socket. Useful carriers include compositions having a high viscosity, such as that provided by glycerol and the like, as well as carrier materials formulated from extracellular matrices and/or which contain laminin, collagen, and/or biocompatible synthetic polymers, such as polybutyric, polylactic, polyglycolic acids and copolymers thereof. In addition, or alternatively, an acellular carrier material may be formulated from bone, dentin, cementum or periodontal tissue by demineralizing and guanidine-extracting the tissue essentially as described herein and/or in U.S. Ser. No. 752,674. Particularly useful acellular matrices include dentin-derived, periodontal ligament-derived and cementum-derived matrices.

In addition, the tooth to be implanted preferably comprises a porous exterior surface onto which the therapeutic agent may be adsorbed, and into which progenitor and differentiating cementoblasts can infiltrate and proliferate. Useful surfaces include natural tooth root surfaces, and porous prosthetic surfaces, including surfaces composed of matrix materials such as collagen, laminin, biocompatible polymers or metals such as titanium oxide. Where a natural tooth or dentin-containing prosthesis is to be implanted, the surface to be implanted first may be partially demineralized, e.g., by transient exposure to an acid to enhance the porosity of the tooth root surface.

Preferably, where the tooth is to be implanted into a tooth socket, the socket has been freed of fibrous tissue which may have formed following tooth loss and periodontal tissue resorption. For example, the tooth socket may have undergone a healing period of several months after loss or removal of the tooth such that scar tissue has formed over the wound. In this case the healed socket preferably is surgically prepared for tooth implantation by removing the scar and other undesired tissue to expose the alveolar bone surface.

Preferably, where the therapeutic agent is to be provided to enhance periodontal tissue viability surrounding an implanted tooth, the therapeutic agent is provided topically to the tissue surfaces between the tooth and gingiva. Alternatively, the agent may be injected locally, e.g., into the gingiva itself.

The morphogens described herein may be used to inhibit periodontal tissue loss and/or to enhance viability of periodontal tissue at risk of damage due to a periodontal disease. The periodontal disease may be caused by an infectious agent, such as a bacterial, fungal or viral agent, or by a nutritional deficiency, including a vitamin deficiency. The morphogens also may be used to regenerate periodontal tissue lost as a result of a neoplastic disease, including squamous cell carcinomas, acute leukemias, lymphomas and metastatic tumors. A detailed description of diseases which damage or destroy periodontal tissue can be found, for example, in Harrison's Principles of Internal Medicine, 243-248, (McGraw-Hill 12th ed. 1991), the disclosure of which is incorporated herein by reference. The efficacy of the morphogens described herein in modulating an inflammatory response and inhibiting tissue damage associated with ulcerations of oral mucosa are described in detail in U.S. Ser. No. 08/462,623, the disclosure of which is incorporated herein by reference.

Although all individuals, and particularly adults, are at risk for periodontal tissue damage due to periodontal disease, a population most particularly at risk are immune-compromised individuals, such as individuals suffering from autoimmune diseases and/or whose immune system has been suppressed as part of a clinical procedure or therapy. Thus, in another aspect, the invention provides methods and compositions for inhibiting periodontal tissue loss in immune-compromised individuals.

As described in copending U.S. Ser. No. 07/752,764, now abandoned, the disclosure of which is incorporated hereinabove by reference, and Example 2, below, the morphogens described herein also can induce formation of damaged or lost dentin tissue. Accordingly, where a natural tooth or dentin-containing prosthesis is to be implanted, a morphogen or morphogen-stimulating agent also may be provided to damaged areas of the tooth to induce dentin regeneration of damaged or lost dentin tissue. The morphogen may be provided topically or otherwise administered to the tooth tissue. For example, the morphogen may be dispersed in a biocompatible, porous carrier material that then is provided topically to the damaged dentin tissue. A useful carrier may be formulated from dentin by demineralizing and guanidine-extracting the tissue to create an acellular matrix.

The morphogens and morphogen-stimulating agents also may be provided to the periodontium together with other molecules ("cofactors") known to have a beneficial effect in treating damaged periodontal tissue, particularly cofactors capable of mitigating or alleviating symptoms typically associated with periodontal tissue damage and/or loss. Examples of such cofactors include antiseptics such as chlorohexidine and tibezonium iodide, antibiotics, including tetracycline, aminoglycosides, macrolides, penicillins and cephalosporins, anaesthetics and analgesics, and other non-steroidal anti-inflammatory agents.

Among the morphogens useful in this invention are proteins originally identified as osteogenic proteins (see U.S. Pat. No. 5,011,691, incorporated herein by reference), such as the OP-1, OP-2 and CBMP2 proteins, as well as amino acid sequence-related proteins such as DPP (from Drosophila), Vgl (from Xenopus), Vgr-1 (from mouse), GDF-1 (from mouse, see Lee (1991) PNAS 88:4250-4254), all of which are presented in Table II and Seq. ID Nos.5-14, and the recently identified 60A protein (from Drosophila, Seq. ID No. 24, see Wharton et al. (1991) PNAS 88:9214-9218.) The members of this family, which include members of the TGF-β super-family of proteins, share substantial amino acid sequence homology in their C-terminal regions. The proteins are translated as a precursor, having an N-terminal signal peptide sequence, typically less than about 30 residues, followed by a "pro" domain that is cleaved to yield the mature sequence. The "pro" form of the protein includes the pro domain and the mature domain, and forms a soluble species that appears to be the primary form secreted from cultured mammalian cells. The signal peptide is cleaved rapidly upon translation, at a cleavage site that can be predicted in a given sequence using the method of Von Heijne ((1986) Nucleic Acids Research 14:4683-4691.) Table I, below, describes the various morphogens identified to date, including their nomenclature as used herein, their Seq. ID references, and publication sources for the amino acid sequences for the full length proteins not included in the Seq. Listing. The disclosure of these publications is incorporated herein by reference.

                  TABLE I                                                          ______________________________________                                         "OP-1"  Refers generically to the group of                                             morphogenically active proteins expressed from                                 part or all of a DNA sequence encoding OP-1                                    protein, including allelic and species variants                                thereof, e.g., human OP-1 ("hOP-1", Seq. ID                                    No. 5, mature protein amino acid sequence), or                                 mouse Op-1 ("mOP-1", Seq. ID No. 6, mature                                     protein amino acid sequence.) The conserved                                    seven cysteine skeleton is defined by residues                                 38 to 139 of Seq. ID Nos. 5 and 6. The cDNA                                    sequences and the amino acids encoding the full                                length proteins are provided in Seq. Id Nos. 16                                and 17 (hOP1) and Seq. ID Nos. 18 and 19                                       (mOP1.) The mature proteins are defined by                                     residues 293-431 (hOP1) and 292-430 (mOP1).                                    The "pro" regions of the proteins, cleaved to                                  yield the mature, morphogenically active                                       proteins are defined essentially by residues                                   30-292 (hOP1) and residues 30-291 (mOP1).                              "OP-2"  Refers generically to the group of active                                      proteins expressed from part or all of a DNA                                   sequence encoding OP-2 protein, including                                      allelic and species variants thereof, e.g.,                                    human OP-2 ("hOP-2", Seq. ID No.7, mature                                      protein amino acid sequence) or mouse OP-2                                     ("mOP-2", Seq. ID No. 8, mature protein amino                                  acid sequence). The conserved seven cysteine                                   skeleton is defined by residues 38 to 139 of                                   Seq. ID Nos. 7 and 8. The cDNA sequences and                                   the amino acids encoding the full length                                       proteins are provided in Seq. ID Nos. 20 and 21                                (hOP2) and Seq. ID Nos. 22 and 23 (mOP2.) The                                  mature proteins are defined essentially by                                     residues 264-402 (hOP2) and 261-399 (mOP2).                                    The "pro" regions of the proteins, cleaved to                                  yield the mature, morphogenically active                                       proteins are defined essentially by residues                                   18-263 (hOP2) and residues 18-260 (mOP1).                              "CBMP2" Refers generically to the morphogenically                                      active proteins expressed from a DNA sequence                                  encoding the CBMP2 proteins, including allelic                                 and species variants thereof, e.g., human                                      CBMP2A ("CBMP2A(fx)", Seq. ID No. 9) or human                                  CBMP2B DNA ("CBMP2B(fx)", Seq. ID No. 10). The                                 amino acid sequence for the full length                                        proteins, referred to in the literature as                                     BMP2A and BMP2B, or BMP2 and BMP4, appear in                                   Wozney, et al. (1988) Science 242:1528-1534.                                   The pro domain for BMP2 (BMP2A) likely includes                                residues 25-248; the mature protein, residues                                  249-396. The pro domain for BMP4 (BMP2B)                                       likely includes residues 25-256; the mature                                    protein, residues 257-408.                                             "DPP(fx)"                                                                              refers to protein sequences encoded by the                                     Drosophila DPP gene and defining the conserved                                 seven cysteine skeleton (Seq. ID No. 11). The                                  amino acid sequence for the full length protein                                appears in Padgett, et al (1987) Nature 325:                                   81-84. The pro domain likely extends from the                                  signal peptide cleavage site to residue 456;                                   the mature protein likely is defined by                                        residues 457-588.                                                      "Vgl(fx)"                                                                              refers to protein sequences encoded by the                                     Xenopus Vgl gene and defining the conserved                                    seven cysteine skeleton (Seq. ID No. 12). The                                  amino acid sequence for the full length protein                                appears in Weeks (1987) Cell 51: 861-867. The                                  prodomain likely extends from the signal                                       peptide cleavage site to residue 246; the                                      mature protein likely is defined by                                            residues 247-360.                                                      "Vgr-1(fx)"                                                                            refers to protein sequences encoded by the                                     murine Vgr-1 gene and defining the conserved                                   seven cysteine skeleton (Seq. ID No. 13). The                                  amino acid sequence for the full length protein                                appears in Lyons, et al, (1989) PNAS 86: 4554-                                 4558. The prodomain likely extends from the                                    signal peptide cleavage site to residue 299;                                   the mature protein likely is defined by                                        residues 300-438.                                                      "GDF-1(fx)"                                                                            refers to protein sequences encoded by the                                     human GDF-1 gene and defining the conserved                                    seven cysteine skeleton (Seq. ID No. 14). The                                  cDNA and encoded amino sequence for the full                                   length protein is provided in Seq. ID No. 32.                                  The prodomain likely extends from the signal                                   peptide clavage site to residue 214; the mature                                protein likely is defined by residues 215-372.                         "60A"   refers generically to the morphogenically                                      active proteins expressed from part or all of a                                DNA sequence (from the Drosophila 60A gene)                                    encoding the 60A proteins (see Seq. ID No. 24                                  wherein the cDNA and encoded amino acid                                        sequence for the full length protein is                                        provided). "60A(fx)" refers to the protein                                     sequences defining the conserved seven cysteine                                skeleton (residues 354 to 455 of Seq. ID No.                                   24.) The prodomain likely extends from the                                     signal peptide cleavage site to residue 324;                                   the mature protein likely is defined by                                        residues 325-455.                                                      "BMP3(fx)"                                                                             refers to protein sequences encoded by the                                     human BMP3 gene and defining the conserved                                     seven cysteine skeleton (Seq. ID No. 26). The                                  amino acid sequence for the full length protein                                appears in Wozney et al. (1988) Science 242:                                   1528-1534. The pro domain likely extends from                                  the signal peptide cleavage site to residue                                    290; the mature protein likely is defined by                                   residues 291-472.                                                      "BMP5(fx)"                                                                             refers to protein sequences encoded by the                                     human BMP5 gene and defining the conserved                                     seven cysteine skeleton (Seq. ID No. 27). The                                  amino acid sequence for the full length protein                                appears in Celeste, et al. (1991) PNAS 87:                                     9843-9847. The pro domain likely extends from                                  the signal peptide cleavage site to residue                                    316; the mature protein likely is defined by                                   residues 317-454.                                                      "BMP6(fx)"                                                                             refers to protein sequences encoded by the                                     human BMP6 gene and defining the conserved                                     seven cysteine skeleton (Seq. ID No. 28). The                                  amino acid sequence for the full length protein                                appears in Celeste, et al. (1990) PNAS 87:                                     9843-5847. The pro domain likely includes                                      extends from the signal peptide cleavage site                                  to residue 374; the mature sequence likely                                     includes residues 375-513.                                             ______________________________________                                    

The OP-2 proteins have an additional cysteine residue in the conserved region (e.g., see residue 41 of Seq. ID Nos. 7 and 8), in addition to the conserved cysteine skeleton in common with the other proteins in this family. The GDF-1 protein has a four amino acid insert within the conserved skeleton (residues 44-47 of Seq. ID No. 14) but this insert likely does not interfere with the relationship of the cysteines in the folded structure. In addition, the CBMP2 proteins are missing one amino acid residue within the cysteine skeleton.

The morphogens are inactive when reduced, but are active as oxidized homodimers and when oxidized in combination with other morphogens of this invention. Thus, as defined herein, a morphogen is a dimeric protein comprising a pair of polypeptide chains, wherein each polypeptide chain comprises at least the C-terminal six cysteine skeleton defined by residues 43-139 of Seq. ID No. 5, including functionally equivalent arrangements of these cysteines (e.g., amino acid insertions or deletions which alter the linear arrangement of the cysteines in the sequence but not their relationship in the folded structure), such that, when the polypeptide chains are folded, the dimeric protein species comprising the pair of polypeptide chains has the appropriate three-dimensional structure, including the appropriate intra- and/or inter-chain disulfide bonds such that the protein is capable of acting as a morphogen as defined herein. Specifically, the morphogens generally are capable of all of the following biological functions in a morphogenically permissive environment: stimulating proliferation of progenitor cells; stimulating the differentiation of progenitor cells; stimulating the proliferation of differentiated cells; and supporting the growth and maintenance of differentiated cells, including the "redifferentiation" of transformed cells. In addition, it is also anticipated that these morphogens are capable of inducing redifferentiation of committed cells under appropriate environmental conditions.

In one preferred aspect, the morphogens of this invention comprise one of two species of generic amino acid sequences: Generic Sequence 1 (Seq. ID No. 1) or Generic Sequence 2 (Seq. ID No. 2); where each Xaa indicates one of the 20 naturally-occurring L-isomer, α-amino acids or a derivative thereof. Generic Sequence 1 comprises the conserved six cysteine skeleton and Generic Sequence 2 comprises the conserved six cysteine skeleton plus the additional cysteine identified in OP-2 (see residue 36, Seq. ID No. 2). In another preferred aspect, these sequences further comprise the following additional sequence at their N-terminus: ##STR1##

Preferred amino acid sequences within the foregoing generic sequences include: Generic Sequence 3 (Seq. ID No. 3), Generic Sequence 4 (Seq. ID No. 4), Generic Sequence 5 (Seq. ID No. 30) and Generic Sequence 6 (Seq. ID No. 31), listed below. These Generic Sequences accommodate the homologies shared among the various preferred members of this morphogen family identified in Table II, as well as the amino acid sequence variation among them. Generic Sequences 3 and 4 are composite amino acid sequences of the proteins presented in Table II and identified in Seq. ID Nos. 5-14, specifically: human OP-1 (hOP-1, Seq. ID Nos. 5 and 16-17), mouse OP-1 (mOP-1, Seq. ID Nos. 6 and 18-19), human and mouse OP-2 (Seq. ID Nos. 7, 8, and 20-22), CBMP2A (Seq. ID No. 9), CBMP2B (Seq. ID No. 10), DPP (from Drosophila, Seq. ID No. 11), Vgl, (from Xenopus, Seq. ID No. 12), Vgr-1 (from mouse, Seq. ID No. 13), and GDF-1 (from mouse, Seq. ID No. 14.) The generic sequences include both the amino acid identity shared by the sequences in Table II, as well as alternative residues for the variable positions within the sequence. Note that these generic sequences allow for an additional cysteine at position 41 or 46 in Generic Sequences 3 or 4, respectively, providing an appropriate cysteine skeleton where inter- or intramolecular disulfide bonds can form, and contain certain critical amino acids which influence the tertiary structure of the proteins. ##STR2## wherein each Xaa is independently selected from a group of one or more specified amino acids defined as follows: "Res." means "residue" and Xaa at res.4=(Ser, Asp or Glu); Xaa at res.6=(Arg, Gln, Ser or Lys); Xaa at res.7=(Asp or Glu); Xaa at res.8=(Leu or Val); Xaa at res.11=(Gln, Leu, Asp, His or Asn); Xaa at res.12=(Asp, Arg or Asn); Xaa at res.14=(Ile or Val); Xaa at res.15=(Ile or Val); Xaa at res.18=(Glu, Gln, Leu, Lys, Pro or Arg); Xaa at res.20=(Tyr or Phe); Xaa at res.21=(Ala, Ser, Asp, Met, His, Leu or Gln); Xaa at res.23=(Tyr, Asn or Phe); Xaa at res.26=(Glu, His, Tyr, Asp or Gln); Xaa at res.28=(Glu, Lys, Asp or Gln); Xaa at res.30=(Ala, Ser, Pro or Gln); Xaa at res.31=(Phe, Leu or Tyr); Xaa at res.33=(Leu or Val); Xaa at res.34=(Asn, Asp, Ala or Thr); Xaa at res.35=(Ser, Asp, Glu, Leu or Ala); Xaa at res.36=(Tyr, Cys, His, Ser or Ile); Xaa at res.37=(Met, Phe, Gly or Leu); Xaa at res.38=(Asn or Ser); Xaa at res.39=(Ala, Ser or Gly); Xaa at res.40=(Thr, Leu or Ser); Xaa at res.44=(Ile or Val); Xaa at res.45=(Val or Leu); Xaa at res.46=(Gln or Arg); Xaa at res.47=(Thr, Ala or Ser); Xaa at res.49=(Val or Met); Xaa at res.50=(His or Asn); Xaa at res.51=(Phe, Leu, Asn, Ser, Ala or Val); Xaa at res.52=(Ile, Met, Asn, Ala or Val); Xaa at res.53=(Asn, Lys, Ala or Glu); Xaa at res.54=(Pro or Ser); Xaa at res.55=(Glu, Asp, Asn, or Gly); Xaa at res.56=(Thr, Ala, Val, Lys, Asp, Tyr, Ser or Ala); Xaa at res.57=(Val, Ala or Ile); Xaa at res.58=(Pro or Asp); Xaa at res.59=(Lys or Leu); Xaa at res.60=(Pro or Ala); Xaa at res.63=(Ala or Val); Xaa at res.65=(Thr or Ala); Xaa at res.66=(Gln, Lys, Arg or Glu); Xaa at res.67=(Leu, Met or Val); Xaa at res.68=(Asn, Ser or Asp); Xaa at res.69=(Ala, Pro or Ser); Xaa at res.70=(Ile, Thr or Val); Xaa at res.71=(Ser or Ala); Xaa at res.72=(Val or Met); Xaa at res.74=(Tyr or Phe); Xaa at res.75=(Phe, Tyr or Leu); Xaa at res.76=(Asp or Asn); Xaa at res.77=(Asp, Glu, Asn or Ser); Xaa at res.78=(Ser, Gln, Asn or Tyr); Xaa at res.79=(Ser, Asn, Asp or Glu); Xaa at res.80=(Asn, Thr or Lys); Xaa at res.82=(Ile or Val); Xaa at res.84=(Lys or Arg); Xaa at res.85=(Lys, Asn, Gln or His); Xaa at res.86=(Tyr or His); Xaa at res.87=(Arg, Gln or Glu); Xaa at res.88=(Asn, Glu or Asp); Xaa at res.90=(Val, Thr or Ala); Xaa at res.92=(Arg, Lys, Val, Asp or Glu); Xaa at res.93=(Ala, Gly or Glu); and Xaa at res.97=(His or Arg); ##STR3## wherein each Xaa is independently selected from a group of one or more specified amino acids as defined by the following: "Res." means "residue" and Xaa at res.2=(Lys or Arg); Xaa at res.3=(Lys or Arg); Xaa at res.4=(His or Arg); Xaa at res.5=(Glu, Ser, His, Gly, Arg or Pro); Xaa at res.9=(Ser, Asp or Glu); Xaa at res.11=(Arg, Gln, Ser or Lys); Xaa at res.12=(Asp or Glu); Xaa at res.13=(Leu or Val); Xaa at res.16=(Gln, Leu, Asp, His or Asn); Xaa at res.17=(Asp, Arg, or Asn); Xaa at res.19=(Ile or Val); Xaa at res.20=(Ile or Val); Xaa at res.23=(Glu, Gln, Leu, Lys, Pro or Arg); Xaa at res.25=(Tyr or Phe); Xaa at res.26=(Ala, Ser, Asp, Met, His, Leu, or Gln); Xaa at res.28=(Tyr, Asn or Phe); Xaa at res.31=(Glu, His, Tyr, Asp or Gln); Xaa at res.33=Glu, Lys, Asp or Gln); Xaa at res.35=(Ala, Ser or Pro); Xaa at res.36=(Phe, Leu or Tyr); Xaa at res.38=(Leu or Val); Xaa at res.39=(Asn, Asp, Ala or Thr); Xaa at res.40=(Ser, Asp, Glu, Leu or Ala); Xaa at res.41=(Tyr, Cys, His, Ser or Ile); Xaa at res.42=(Met, Phe, Gly or Leu); Xaa at res.44=(Ala, Ser or Gly); Xaa at res.45=(Thr, Leu or Ser); Xaa at res.49=(Ile or Val); Xaa at res.50=(Val or Leu); Xaa at res.51=(Gln or Arg); Xaa at res.52=(Thr, Ala or Ser); Xaa at res.54=(Val or Met); Xaa at res.55=(His or Asn); Xaa at res.56=(Phe, Leu, Asn, Ser, Ala or Val); Xaa at res.57=(Ile, Met, Asn, Ala or Val); Xaa at res.58=(Asn, Lys, Ala or Glu); Xaa at res.59=(Pro or Ser); Xaa at res.60=(Glu, Asp, or Gly); Xaa at res.61=(Thr, Ala, Val, Lys, Asp, Tyr, Ser or Ala); Xaa at res.62=(Val, Ala or Ile); Xaa at res.63=(Pro or Asp); Xaa at res.64=(Lys or Leu); Xaa at res.65=(Pro or Ala); Xaa at res.68=(Ala or Val); Xaa at res.70=(Thr or Ala); Xaa at res.71=(Gln, Lys, Arg or Glu); Xaa at res.72=(Leu, Met or Val); Xaa at res.73=(Asn, Ser or Asp); Xaa at res.74=(Ala, Pro or Ser); Xaa at res.75=(Ile, Thr or Val); Xaa at res.76=(Ser or Ala); Xaa at res.77=(Val or Met); Xaa at res.79=(Tyr or Phe); Xaa at res.80=(Phe, Tyr or Leu); Xaa at res.81=(Asp or Asn); Xaa at res.82=(Asp, Glu, Asn or Ser); Xaa at res.83=(Ser, Gln, Asn or Tyr); Xaa at res.84=(Ser, Asn, Asp or Glu); Xaa at res.85=(Asn, Thr or Lys); Xaa at res.87=(Ile or Val); Xaa at res.89=(Lys or Arg); Xaa at res.90=(Lys, Asn, Gln or His); Xaa at res.91=(Tyr or His); Xaa at res.92=(Arg, Gln or Glu); Xaa at res.93=(Asn, Glu or Asp); Xaa at res.95=(Val, Thr or Ala); Xaa at res.97=(Arg, Lys, Val, Asp or Glu); Xaa at res.98=(Ala, Gly or Glu); and Xaa at res.102=(His or Arg).

Similarly, Generic Sequence 5 (Seq. ID No. 30) and Generic Sequence 6 (Seq. ID No. 31) accommodate the homologies shared among all the morphogen protein family members identified in Table II. Specifically, Generic Sequences 5 and 6 are composite amino acid sequences of human OP-1 (hOP-1, Seq. ID Nos. 5 and 16-17), mouse OP-1 (mOP-1, Seq. ID Nos. 6 and 18-19), human and mouse OP-2 (Seq. ID Nos. 7, 8, and 20-22), CBMP2A (Seq. ID No. 9), CBMP2B (Seq. ID No. 10), DPP (from Drosophila, Seq. ID No. 11), Vgl, (from Xenopus, Seq. ID No. 12), Vgr-1 (from mouse, Seq. ID No. 13), and GDF-1 (from mouse, Seq. ID No. 14), human BMP3 (Seq. ID No. 26), human BMP5 (Seq. ID No. 27), human BMP6 (Seq. ID No. 28) and 60(A) (from Drosophila, Seq. ID Nos. 24-25). The generic sequences include both the amino acid identity shared by these sequences in the C-terminal domain, defined by the six and seven cysteine skeletons (Generic Sequences 5 and 6, respectively), as well as alternative residues for the variable positions within the sequence. As for Generic Sequences 3 and 4, Generic Sequences 5 and 6 allow for an additional cysteine at position 41 (Generic Sequence 5) or position 46 (Generic Sequence 6), providing an appropriate cysteine skeleton where inter- or intramolecular disulfide bonds can form, and containing certain critical amino acids which influence the tertiary structure of the proteins. ##STR4## wherein each Xaa is independently selected from a group of one or more specified amino acids defined as follows: "Res." means "residue" and Xaa at res.2=(Tyr or Lys); Xaa at res.3=Val or Ile); Xaa at res.4=(Ser, Asp or Glu); Xaa at res.6=(Arg, Gln, Ser, Lys or Ala); Xaa at res.7=(Asp, Glu or Lys); Xaa at res.8=(Leu, Val or Ile); Xaa at res.11=(Gln, Leu, Asp, His, Asn or Ser); Xaa at res.12=(Asp, Arg, Asn or Glu); Xaa at res.14=(Ile or Val); Xaa at res.15=(Ile or Val); Xaa at res.16 (Ala or Ser); Xaa at res.18=(Glu, Gln, Leu, Lys, Pro or Arg); Xaa at res.19=(Gly or Ser); Xaa at res.20=(Tyr or Phe); Xaa at res.21=(Ala, Ser, Asp, Met, His, Gln, Leu or Gly); Xaa at res.23=(Tyr, Asn or Phe); Xaa at res.26=(Glu, His, Tyr, Asp, Gln or Ser); Xaa at res.28=(Glu, Lys, Asp, Gln or Ala); Xaa at res.30=(Ala, Ser, Pro, Gln or Asn); Xaa at res.31=(Phe, Leu or Tyr); Xaa at res.33=(Leu, Val or Met); Xaa at res.34=(Asn, Asp, Ala, Thr or Pro); Xaa at res.35=(Ser, Asp, Glu, Leu, Ala or Lys); Xaa at res.36=(Tyr, Cys, His, Ser or Ile); Xaa at res.37=(Met, Phe, Gly or Leu); Xaa at res.38=(Asn, Ser or Lys); Xaa at res.39=(Ala, Ser, Gly or Pro); Xaa at res.40=(Thr, Leu or Ser); Xaa at res.44=(Ile, Val or Thr); Xaa at res.45=(Val, Leu or Ile); Xaa at res.46=(Gln or Arg); Xaa at res.47=(Thr, Ala or Ser); Xaa at res.48=(Leu or Ile); Xaa at res.49=(Val or Met); Xaa at res.50=(His, Asn or Arg); Xaa at res.51=(Phe, Leu, Asn, Ser, Ala or Val); Xaa at res.52=(Ile, Met, Asn, Ala, Val or Leu); Xaa at res.53=(Asn, Lys, Ala, Glu, Gly or Phe); Xaa at res.54=(Pro, Ser or Val); Xaa at res.55=(Glu, Asp, Asn, Gly, Val or Lys); Xaa at res.56=(Thr, Ala, Val, Lys, Asp, Tyr, Ser, Ala, Pro or His); Xaa at res.57=(Val, Ala or Ile); Xaa at res.58=(Pro or Asp); Xaa at res.59=(Lys, Leu or Glu); Xaa at res.60=(Pro or Ala); Xaa at res.63=(Ala or Val); Xaa at res.65=(Thr, Ala or Glu); Xaa at res.66=(Gln, Lys, Arg or Glu); Xaa at res.67=(Leu, Met or Val); Xaa at res.68=(Asn, Ser, Asp or Gly); Xaa at res.69=(Ala, Pro or Ser); Xaa at res.70=(Ile, Thr, Val or Leu); Xaa at res.71=(Ser, Ala or Pro); Xaa at res.72=(Val, Met or Ile); Xaa at res.74=(Tyr or Phe); Xaa at res.75=(Phe, Tyr, Leu or His); Xaa at res.76=(Asp, Asn or Leu); Xaa at res.77=(Asp, Glu, Asn or Ser); Xaa at res.78=(Ser, Gln, Asn, Tyr or Asp); Xaa at res.79=(Ser, Asn, Asp, Glu or Lys); Xaa at res.80=(Asn, Thr or Lys); Xaa at res.82=(Ile, Val or Asn); Xaa at res.84=(Lys or Arg); Xaa at res.85=(Lys, Asn, Gln, His or Val); Xaa at res.86=(Tyr or His); Xaa at res.87=(Arg, Gln, Glu or Pro); Xaa at res.88=(Asn, Glu or Asp); Xaa at res.90=(Val, Thr, Ala or Ile); Xaa at res.92=(Arg, Lys, Val, Asp or Glu); Xaa at res.93=(Ala, Gly, Glu or Ser); Xaa at res.95=(Gly or Ala) and Xaa at res.97=(His or Arg). ##STR5## wherein each Xaa is independently selected from a group of one or more specified amino acids as defined by the following: "Res." means "residue" and Xaa at res.2=(Lys, Arg, Ala or Gln); Xaa at res.3=(Lys, Arg or Met); Xaa at res.4=(His, Arg or Gln); Xaa at res.5=(Glu, Ser, His, Gly, Arg, Pro, Thr, or Tyr); Xaa at res.7=(Tyr or Lys); Xaa at res.8=(Val or Ile); Xaa at res.9=(Ser, Asp or Glu); Xaa at res.11=(Arg, Gln, Ser, Lys or Ala); Xaa at res.12=(Asp, Glu, or Lys); Xaa at res.13=(Leu, Val or Ile); Xaa at res.16=(Gln, Leu, Asp, His, Asn or Ser); Xaa at res.17=(Asp, Arg, Asn or Glu); Xaa at res.19=(Ile or Val); Xaa at res.20=(Ile or Val); Xaa at res.21=(Ala or Ser); Xaa at res.23=(Glu, Gln, Leu, Lys, Pro or Arg); Xaa at res.24=(Gly or Ser); Xaa at res.25=(Tyr or Phe); Xaa at res.26=(Ala, Ser, Asp, Met, His, Gln, Leu, or Gly); Xaa at res.28=(Tyr, Asn or Phe); Xaa at res.31=(Glu, His, Tyr, Asp, Gln or Ser); Xaa at res.33=Glu, Lys, Asp, Gln or Ala); Xaa at res.35=(Ala, Ser, Pro, Gln or Asn); Xaa at res.36=(Phe, Leu or Tyr); Xaa at res.38=(Leu, Val or Met); Xaa at res.39=(Asn, Asp, Ala, Thr or Pro); Xaa at res.40=(Ser, Asp, Glu, Leu, Ala or Lys); Xaa at res.41=(Tyr, Cys, His, Ser or Ile); Xaa at res.42=(Met, Phe, Gly or Leu); Xaa at res.43=(Asn, Ser or Lys); Xaa at res.44=(Ala, Ser, Gly or Pro); Xaa at res.45=(Thr, Leu or Ser); Xaa at res.49=(Ile, Val or Thr); Xaa at res.50=(Val, Leu or Ile); Xaa at res.51=(Gln or Arg); Xaa at res.52=(Thr, Ala or Ser); Xaa at res.53=(Leu or Ile); Xaa at res.54=(Val or Met); Xaa at res.55=(His, Asn or Arg); Xaa at res.56=(Phe, Leu, Asn, Ser, Ala or Val); Xaa at res.57=(Ile, Met, Asn, Ala, Val or Leu); Xaa at res.58=(Asn, Lys, Ala, Glu, Gly or Phe); Xaa at res.59=(Pro, Ser or Val); Xaa at res.60=(Glu, Asp, Gly, Val or Lys); Xaa at res.61=(Thr, Ala, Val, Lys, Asp, Tyr, Ser, Ala, Pro or His); Xaa at res.62=(Val, Ala or Ile); Xaa at res.63=(Pro or Asp); Xaa at res.64=(Lys, Leu or Glu); Xaa at res.65=(Pro or Ala); Xaa at res.68=(Ala or Val); Xaa at res.70=(Thr, Ala or Glu); Xaa at res.71=(Gln, Lys, Arg or Glu); Xaa at res.72=(Leu, Met or Val); Xaa at res.73=(Asn, Ser, Asp or Gly); Xaa at res.74=(Ala, Pro or Ser); Xaa at res.75=(Ile, Thr, Val or Leu); Xaa at res.76=(Ser, Ala or Pro); Xaa at res.77=(Val, Met or Ile); Xaa at res.79=(Tyr or Phe); Xaa at res.80=(Phe, Tyr, Leu or His); Xaa at res.81=(Asp, Asn or Leu); Xaa at res.82=(Asp, Glu, Asn or Ser); Xaa at res.83=(Ser, Gln, Asn, Tyr or Asp); Xaa at res.84=(Ser, Asn, Asp, Glu or Lys); Xaa at res.85=(Asn, Thr or Lys); Xaa at res.87=(Ile, Val or Asn); Xaa at res.89=(Lys or Arg); Xaa at res.90=(Lys, Asn, Gln, His or Val); Xaa at res.91=(Tyr or His); Xaa at res.92=(Arg, Gln, Glu or Pro); Xaa at res.93=(Asn, Glu or Asp); Xaa at res.95=(Val, Thr, Ala or Ile); Xaa at res.97=(Arg, Lys, Val, Asp or Glu); Xaa at res.98=(Ala, Gly, Glu or Ser); Xaa at res.100=(Gly or Ala); and Xaa at res.102=(His or Arg).

Particularly useful sequences for use as morphogens in this invention include the C-terminal domains, e.g., the C-terminal 96-102 amino acid residues of Vgl, Vgr-1, DPP, OP-1, OP-2, CBMP-2A, CBMP-2B, GDF-1 (see Table II, below, and Seq. ID Nos. 5-14), as well as proteins comprising the C-terminal domains of 60A, BMP3, BMP5 and BMP6 (see Seq. ID Nos. 24-28), all of which include at least the conserved six or seven cysteine skeleton. In addition, biosynthetic constructs designed from the generic sequences, such as COP-1, 3-5, 7, 16, disclosed in U.S. Pat. No. 5,011,691, also are useful. Other sequences include the inhibins/activin proteins (see, for example, U.S. Pat. Nos. 4,968,590 and 5,011,691). Accordingly, other useful sequences are those sharing at least 70% amino acid sequence homology or "similarity", and preferably 80% homology or similarity with any of the sequences above. These are anticipated to include allelic and species variants and mutants, and biosynthetic muteins, as well as novel members of this morphogenic family of proteins. Particularly envisioned in the family of related proteins are those proteins exhibiting morphogenic activity and wherein the amino acid changes from the preferred sequences include conservative changes, e.g., those as defined by Dayoff et al., Atlas of Protein Sequence and Structure; vol. 5, Suppl. 3, pp. 345-362, (M. O. Dayoff, ed., Nat'l BioMed. Research Fdn., Washington, D.C. 1979). As used herein, potentially useful sequences are aligned with a known morphogen sequence using the method of Needleman et al. ((1970) J.Mol.Biol. 48:443-453) and identities calculated by the Align program (DNAstar, Inc.). "Homology" or "similarity" as used herein includes allowed conservative changes as defined by Dayoff et al.

The currently most preferred protein sequences useful as morphogens in this invention include those having greater than 60% identity, preferably greater than 65% identity, with the amino acid sequence defining the conserved six cysteine skeleton of hOP1 (e.g., residues 43-139 of Seq. ID No. 5). These most preferred sequences include both allelic and species variants of the OP-1 and OP-2 proteins, including the Drosophila 60A protein. Accordingly, in another preferred aspect of the invention, useful morphogens include active proteins comprising species of polypeptide chains having the generic amino acid sequence herein referred to as "OPX" (Seq. ID No. 29), which defines the seven cysteine skeleton and accommodates the homologies between the various identified species of OP1 and OP2. As described therein, each Xaa at a given position independently is selected from the residues occurring at the corresponding position in the C-terminal sequence of mouse or human OP1 or OP2 (see Seq. ID Nos. 5-8 and/or Seq. ID Nos. 16-23).

The morphogens useful in the methods, compositions and devices of this invention include proteins comprising any of the polypeptide chains described above, whether isolated from naturally-occurring sources, or produced by recombinant DNA or other synthetic techniques, and includes allelic and species variants of these proteins, naturally-occurring or biosynthetic mutants thereof, as well as various truncated and fusion constructs. Deletion or addition mutants also are envisioned to be active, including those which may alter the conserved C-terminal cysteine skeleton, provided that the alteration does not functionally disrupt the relationship of these cysteines in the folded structure. Accordingly, such active forms are considered the equivalent of the specifically described constructs disclosed herein. The proteins may include forms having varying glycosylation patterns, varying N-termini, a family of related proteins having regions of amino acid sequence homology, and active truncated or mutated forms of native or biosynthetic proteins, produced by expression of recombinant DNA in host cells.

The morphogenic proteins can be expressed from intact or truncated cDNA or from synthetic DNAs in procaryotic or eucaryotic host cells, and purified, cleaved, refolded, and dimerized to form morphogenically active compositions. Currently preferred host cells include E. coli or mammalian cells, such as CHO, COS or BSC cells. A detailed description of the morphogens useful in the methods, compositions and devices of this invention is disclosed in copending U.S. patent application Ser. Nos. 752,764, filed Aug. 30, 1991, and 667,724, filed Mar. 11, 1991, the disclosures of which are incorporated herein by reference.

Thus, in view of this disclosure, skilled genetic engineers can isolate genes from cDNA or genomic libraries of various different species which encode appropriate amino acid sequences, or construct DNAs from oligonucleotides, and then can express them in various types of host cells, including both procaryotes and eucaryotes, to produce large quantities of active proteins capable of stimulating the morphogenesis of, and/or inhibiting damage to, periodontal tissue.

Other features and advantages of the invention will be apparent from the following description of the preferred embodiments, and from the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other objects and features of this invention, as well as the invention itself, may be more fully understood from the following description, when read together with the accompanying drawings, in which:

FIG. 1 is a schematic illustration of a healthy tooth in the tooth socket; and

FIG. 2 (A and B) are photomicrographs demonstrating the effect of morphogen (2A) or carrier alone (2B) on periodontal tissue regeneration in a surgically prepared canine tooth socket.

DETAILED DESCRIPTION

It has been discovered that the morphogens described herein can stimulate periodontal tissue formation, including regenerating lost or damaged periodontal ligament and/or cementum. The invention may be used for tooth implant integration as well as to inhibit and/or repair periodontal tissue loss due to disease or mechanical injury. The invention is practiced using a morphogen or morphogen-stimulating agent, as defined herein, and according to the procedures described herein.

Provided below is a description of tooth anatomy and useful morphogens, including methods for their production and formulation, as well as exemplary, non-limiting examples which (1) demonstrate the suitability of the morphogens described herein in the methods of the invention, and (2) provide assays with which to test candidate morphogens for their efficacy.

I. Tooth Anatomy

A vertical section of a tooth in the tooth socket is shown schematically in FIG. 1. The crown 6 of the tooth is composed of enamel 8 and dentin 22. The pulp chamber 12 is seen in the interior of the crown 6 and the center of the root 10; it extends downward into the bony area 14, 16, 18 and opens by a minute orifice, the apical foramen 20, at the extremity of the root 10. The pulp chamber 12 contains dental pulp, a loose connective tissue richly supplied with vessels and nerves, which enter the cavity through the apical foramen 20. Some of the cells of the pulp, i.e., odontoblasts, the precursors of dentin 22, are arranged as a layer on the wall of the pulp chamber 12. During development of the tooth, odontoblasts are columnar, but later, after the dentin 22 is fully formed, they become flattened and resemble osteoblasts.

The solid portion of the mature tooth includes dentin 22, enamel 8, and a thin layer of cementum 24, which is disposed on the surface of the root 25. Enamel 8 is formed during development of the tooth from amyloblasts, and cementum 24 is formed from cementoblasts. In a fully developed tooth, the principal mass of the tooth comprises dentin 22, which is made up of hydroxyapatite crystals embedded in a strong meshwork of collagen fibers. The dentin includes a number of minute wavy and branching tubes called dental canaliculi, embedded in a dense homogeneous substance, the matrix. The dental canaliculi are parallel with one another and open at their inner ends into the pulp chamber 12. The dentin matrix is translucent and comprises the majority of the inorganic mass of the dentin. It includes a number of fine fibrils, which are continuous with the fibrils of the dental pulp. After the organic matter has been removed by steeping a tooth in weak acid, the remaining organic matter may be torn into laminae that run parallel with the pulp chamber 12 across the direction of the tubes.

The cementum 24 is disposed as a thin mineralized layer covering the tooth root. It extends from where the enamel terminates to the apex of each root, where it is usually very thick. Cementum resembles bone in structure and chemical composition in that it contains, sparingly, the lacunae and canaliculi that characterize true bone; in the thicker portions of the cementum, the lamellae and Haversian canals peculiar to bone are also found. As a result of aging, the cementum increases in thickness and the pulp chamber also becomes partially filled with a hard substance that is intermediate in structure between dentin and bone. It appears to be formed by a slow conversion of the dental pulp, which shrinks or even disappears.

The periodontal ligament, or periodontal membrane 26, is the layer of periodontal tissue which forms a cushion between the cementum 24 and the bone 14, 16, 18; it holds the tooth in position by suspending it in the socket (alveolus) of the jawbone. The periodontal ligament is a highly organized tissue which is formed from periodontal fibroblasts. It organizes the collagen fibers which pass directly from the bone of the jaw into the cementum.

II. Useful Morphogens

As defined herein a protein is morphogenic if it is capable of inducing the developmental cascade of cellular and molecular events that culminate in the formation of new, organ-specific tissue and comprises at least the conserved C-terminal six cysteine skeleton or its functional equivalent (see supra). Specifically, the morphogens generally are capable of all of the following biological functions in a morphogenically permissive environment: stimulating proliferation of progenitor cells; stimulating the differentiation of progenitor cells; stimulating the proliferation of differentiated cells; and supporting the growth and maintenance of differentiated cells, including the "redifferentiation" of transformed cells. Details of how the morphogens useful in the method of this invention first were identified, as well as a description on how to make, use and test them for morphogenic activity are disclosed in U.S. Ser. No. 752,764, filed Aug. 30, 1991, the disclosure of which is incorporated hereinabove by reference. As disclosed therein, the morphogens may be purified from naturally-sourced material or recombinantly produced from procaryotic or eucaryotic host cells, using the genetic sequences disclosed therein. Alternatively, novel morphogenic sequences may be identified following the procedures disclosed therein.

Particularly useful proteins include those which comprise the naturally derived sequences disclosed in Table II. Other useful sequences include biosynthetic constructs such as those disclosed in U.S. Pat. No. 5,011,691, the disclosure of which is incorporated herein by reference (e.g., COP-1, COP-3, COP-4, COP-5, COP-7, and COP-16).

Accordingly, the morphogens useful in the methods and compositions of this invention also may be described by morphogenically active proteins having amino acid sequences sharing 70% or, preferably, 80% homology (similarity) with any of the sequences described above, where "homology" is as defined herein above.

The morphogens useful in the method of this invention also can be described by any of the 6 generic sequences described herein (Generic Sequences 1, 2, 3, 4, 5 and 6). Generic sequences 1 and 2 also may include, at their N-terminus, the sequence ##STR6##

Table II, set forth below, compares the amino acid sequences of the active regions of native proteins that have been identified as morphogens, including human OP-1 (hOP-1, Seq. ID Nos. 5 and 16-17), mouse OP-1 (mOP-1, Seq. ID Nos. 6 and 18-19), human and mouse OP-2 (Seq. ID Nos. 7, 8, and 20-23), CBMP2A (Seq. ID No. 9), CBMP2B (Seq. ID No. 10), BMP3 (Seq. ID No. 26), DPP (from Drosophila, Seq. ID No. 11), Vgl, (from Xenopus, Seq. ID No. 12), Vgr-1 (from mouse, Seq. ID No. 13), GDF-1 (from mouse, Seq. ID Nos. 14, 32 and 33), 60A protein (from Drosophila, Seq. ID Nos. 24 and 25), BMP5 (Seq. ID No. 27) and BMP6 (Seq. ID No. 28). The sequences are aligned essentially following the method of Needleman et al. (1970) J. Mol. Biol., 48:443-453, calculated using the Align Program (DNAstar, Inc.) In the table, three dots indicates that the amino acid in that position is the same as the amino acid in hOP-1. Three dashes indicates that no amino acid is present in that position, and are included for purposes of illustrating homologies. For example, amino acid residue 60 of CBMP-2A and CBMP-2B is "missing". Of course, both these amino acid sequences in this region comprise Asn-Ser (residues 58, 59), with CBMP-2A then comprising Lys and Ile, whereas CBMP-2B comprises Ser and Ile.

                  TABLE II                                                         ______________________________________                                         hoP-1   Cys    Lys    Lys  His  Glu  Leu  Tyr  Val                             mOP-1   ...    ...    ...  ...  ...  ...  ...  ...                             hOP-2   ...    Arg    Arg  ...  ...  ...  ...  ...                             mOP-2   ...    Arg    Arg  ...  ...  ...  ...  ...                             DPP     ...    Arg    Arg  ...  Ser  ...  ...  ...                             Vgl     ...    ...    Lys  Arg  His  ...  ...  ...                             Vgr-1   ...    ...    ...  ...  Gly  ...  ...  ...                             GDF-1   Gln    ...    Glu  Asp  ...  ...  ...  Asp                             60A     ...    ...    ...  ...  ...  Ile  ...  Lys                             BMP5    ...    ...    ...  ...  ...  ...  ...  ...                             BMP6    ...    ...    ...  Trp  ...  ...  ...  ...                                     90                           95                                        hOP-1   Ala    Cys    Gly  Cys  His                                            mOP-1   ...    ...    ...  ...  ...                                            hOP-2   ...    ...    ...  ...  ...                                            mOP-2   ...    ...    ...  ...  ...                                            DPP     Gly    ...    ...  ...  Arg                                            Vgl     Glu    ...    ...  ...  Arg                                            Vgr-1   ...    ...    ...  ...  ...                                            CBMP-2A Gly    ...    ...  ...  Arg                                            CBMP-2B Gly    ...    ...  ...  Arg                                            BMP3    Ser    ...    Ala  ...  Arg                                            GDF-1   Glu    ...    ...  ...  Arg                                            60A     Ser    ...    ...  ...  ...                                            BMP5    Ser    ...    ...  ...  ...                                            BMP6    ...    ...    ...  ...  ...                                                                  100                                                      ______________________________________                                          **Between residues 56 and 57 of BMP3 is a Val residue; between residues 4      and 44 of GDF1 lies the amino acid sequence GlyGly-Pro-Pro.              

As is apparent from the foregoing amino acid sequence comparisons, significant amino acid changes can be made within the generic sequences while retaining the morphogenic activity. For example, while the GDF-1 protein sequence depicted in Table II shares only about 50% amino acid identity with the hOP1 sequence described therein, the GDF-1 sequence shares greater than 70% amino acid sequence homology (or "similarity") with the hOP1 sequence, where "homology" or "similarity" includes allowed conservative amino acid changes within the sequence as defined by Dayoff, et al., Atlas of Protein Sequence and Structure vol.5, supp.3, pp.345-362, (M. O. Dayoff, ed., Nat'l BioMed. Res. Fd'n, Washington D.C. 1979.)

The currently most preferred protein sequences useful as morphogens in this invention include those having greater than 60% identity, preferably greater than 65% identity, with the amino acid sequence defining the conserved six cysteine skeleton of hOP1 (e.g., residues 43-139 of Seq. ID No. 5). These most preferred sequences include both allelic and species variants of the OP-1 and OP-2 proteins, including the Drosophila 60A protein. Accordingly, in still another preferred aspect, the invention includes morphogens comprising species of polypeptide chains having the generic amino acid sequence referred to herein as "OPX", which defines the seven cysteine skeleton and accommodates the identities between the various identified mouse and human OP1 and OP2 proteins. OPX is presented in Seq. ID No. 29. As described therein, each Xaa at a given position independently is selected from the residues occurring at the corresponding position in the C-terminal sequence of mouse or human OP1 or OP2 (see Seq. ID Nos. 5-8 and/or Seq. ID Nos. 16-23).

Alternatively, an effective amount of an agent capable of stimulating endogenous morphogen levels may be administered by any of the routes described herein below. For example, an agent capable of stimulating morphogen production and/or secretion from periodontal tissue cells, alveolar bone tissue cells in the fresh tooth socket, or dentin tissue, may be provided to a mammal, e.g., by direct administration of the morphogen-stimulating agent to the tooth root and/or tooth socket bone surface. Alternatively, the morphogen-stimulating agent may induce morphogen expression and/or secretion at a distant site (e.g., at a tissue locus other than periodontal, dental or alveolar bone tissue), with the expressed morphogen targeting itself to periodontal tissue. A method for identifying and testing agents capable of modulating the levels of endogenous morphogens in a given tissue is described generally herein in Example 3, and in detail in copending U.S. Ser. No. 08/278,729, filed Aug. 28, 1992 and U.S. Ser. No. 752,859, filed Aug. 30, 1991, the disclosures of which are incorporated herein by reference. Briefly, candidate compounds can be identified and tested by incubating the compound in vitro with a test tissue or cells thereof, for a time sufficient to allow the compound to affect the production, i.e., the expression and/or secretion, of a morphogen produced by the cells of that tissue. Here, suitable tissue, or cultured cells of a tissue, preferably comprise periodontal fibroblasts, cementoblasts, odontoblasts or osteoblasts.

III. Formulations and Methods for Administration

1. Therapeutic Agent Considerations

The morphogens may be provided to the tooth root and/or tooth socket surface by any suitable means. Preferably, the morphogen, or a morphogen-stimulating agent, (collectively, the therapeutic agent) is provided directly to the tissue surface by topical administration. Alternatively, the therapeutic agent may be provided to the tissue by, for example, local injection. While not currently preferred, systemic injection also may be a viable administration route for certain applications, such as periodontal tissue maintenance in older adults, immuno-suppressed individuals, or others at chronic risk for periodontal tissue loss. A detailed description of considerations for systemic administration, including oral and parenteral administration, is disclosed, for example, in copending U.S. Ser. No. 08/445,467, incorporated hereinabove by reference.

Where the therapeutic agent is provided directly to the tooth socket, the therapeutic agent may be provided to the socket surface as part of a biocompatible formulation that may be a liquid, gel or solid. The therapeutic agent further may be dispersed in and associated with a carrier capable of maintaining the morphogen at the administered locus. Useful formulations include viscous compositions. Biocompatible compositions that increase the viscosity of the formulation include glycerol, polyalkylene glycols such as polyethylene glycol, oils of vegetable origin, hydrogenated naphthalenes, and the like.

The formulation also may include an in vivo bioresorbable carrier material that acts as a controlled release delivery vehicle. Useful carriers may include biocompatible, preferably biodegradable structural components from, e.g., an extracellular matrix, such as collagen, laminin, hyaluronic acid, and the like, or polymeric materials, such as polylactic, polybutyric and polyglycolic acids. The carrier also may comprise an acellular tissue matrix, substantially depleted in nonstructural components, such as a demineralized, guanidine-extracted dentin, periodontal ligament or cementum matrix. Details for preparing such matrices are disclosed in U.S. Ser. No. 752,764, incorporated hereinabove by reference. Other useful controlled release carriers in which the therapeutic agent may be dispersed are described in U.S. Pat. Nos. 4,975,526 and 4,919,939, the disclosures of which are incorporated herein by reference.

Where the morphogen is to be provided to a tooth root surface, it may be formulated in a composition for controlled delivery as described above and applied topically to the tooth root surface as described below. Alternatively, or in addition, the therapeutic agent may be dispersed in a liquid formulation into which at least the tooth root surface is placed and the liquid lyophilized to adsorb the therapeutic agent onto the tooth surface.

Where the agent is administered to inhibit periodontal tissue loss and/or to regenerate periodontal tissue surrounding an implanted tooth, the agent may be provided to the area between the tooth and gum (gingiva) by injection or by topical application.

Where the morphogen is to be provided directly (e.g., locally, as by injection, e.g., to a periodontal or alveolar tissue site), the morphogen preferably comprises part of an aqueous solution which also may contain a carrier material. The solution is physiologically acceptable so that in addition to delivery of the desired morphogen to the patient, the solution does not otherwise adversely affect the patient's electrolyte and volume balance. The aqueous medium for the morphogen thus may comprise normal physiologic saline (0.85% NaCl, 0.15M), pH 7-7.4. The aqueous solution containing the morphogen can be made, for example, by dissolving the protein in 50% ethanol containing acetonitrile in 0.1% trifluoroacetic acid (TFA) or 0.1% HCl, or equivalent solvents. One volume of the resultant solution then is added, for example, to ten volumes of phosphate buffered saline (PBS), which further may include 0.1-0.2% human serum albumin (HSA). The resultant solution preferably is vortexed extensively. If desired, a given morphogen may be made more soluble in the solution by association with a suitable molecule. For example, the pro form of the morphogenic protein comprises a species that is soluble in physiological solutions. In fact, the endogenous protein is thought to be transported (e.g., secreted and circulated) in this form. This soluble form of the protein may be obtained from the culture medium of morphogen-secreting mammalian cells. Alternatively, a soluble species may be formulated by complexing the mature dimer (or an active fragment thereof) with part or all of a pro domain. Other components, including various serum proteins, also may be useful.

Finally, the morphogens or morphogen-stimulating agents provided herein may be administered alone or in combination with other molecules, particularly symptom alleviating cofactors. Useful pharmaceutical cofactors include antiseptics, antibiotics, anaesthetics and analgesics. Preferred antiseptics for use in the present system include chlorhexidine and tibezonium iodide; preferred antibiotics include tetracycline, aminoglycosides such as neomycin, gentamycin, kanamycin, tobramycin, netilmicin, sisomicin, amicamycin, their sulfates or other derivatives, macrolides such as erythromycin, its salts and other derivatives, spiramycin, josamicin or miocamicin, penicillins such as ampicillin, amoxicillin and the like, and cephalosporins, for example, cefaclor, cefadroxil, cefazolin, cefoperazone, cefotaxime, cephalothin, cefalexin, ceforanide, cefonicide or ceftriaxone. Preferred anaesthetics/analgesics include amide-type local anaesthetics such as lidocaine, mepivacaine, pyrrocaine, bupivacaine, prilocaine, etidocaine, or other widely used anaesthetics such as procaine.

Other cofactors include non-steroidal anti-inflammatory agents. However, the morphogens described herein themselves modulate the body's imflammatory/immune response to an initial tissue injury. Specifically, and as described in detail in U.S. Ser. No. 08/445,467 disclosed hereinabove by reference, in the presence of a morphogen, progenitor inflammatory effector cells induced to migrate to a site of tissue injury do not become significantly activated. Without being limited to any given theory, it is thought that, in the presence of the morphogen, damaged tissue is induced to undergo a recapitulation of tissue morphogenesis, where progenitor cells are induced to proliferate and differentiate in a tissue-specific manner, and new, functional, organized tissue is formed to replace the damaged or lost tissue, rather than disorganized, fibrous scar tissue.

The formulated compositions contain therapeutically effective amounts of the morphogen, e.g., amounts which provide appropriate concentrations of the morphogen to the tooth surface for a time sufficient to stimulate growth and development of periodontal tissues, including morphogenesis of periodontal ligament and/or cementum, and/or to substantially inhibit periodontal tissue loss.

As will be appreciated by those skilled in the art, the concentration of the compounds described in a therapeutic composition will vary depending upon a number of factors, including the biological efficacy of the selected morphogen, the chemical characteristics (e.g., hydrophobicity) of the compounds employed, the formulation of the compound excipients, the administration route, and the treatment envisioned. The preferred dosage to be administered also is likely to depend on such variables such as the condition of the tissues within the tooth socket, the size of the tooth or tooth socket, the length of time after tooth loss, extent of periodontal tissue loss and the overall health status of the particular patient. The amount of morphogen applied also will depend on the tooth size. In general, 0.1-1000 μg of morphogen are sufficient with 1-100 μg being preferable. For example, for a large tooth, e.g., an incisor or large molar, about 10-100 μg, and preferably 50 μg of morphogen, may be used to advantage; a medium tooth may be treated with approximately 5-50 μg, and preferably 25 μg; and a small tooth, with approximately 1-25, preferably 5-10 μg morphogen. No obvious morphogen induced pathological lesions are induced when mature morphogen (e.g., OP-1, 20 μg) is administered daily to normal growing rats for 21 consecutive days. Moreover, 10 μg systemic injections of morphogen (e.g., OP-1) injected daily for 10 days into normal newborn mice does not produce any gross abnormalities.

2. Tooth Preparation

Tooth loss may be repaired by implanting a viable tooth having a healthy root and pulp system or by implanting a tooth prosthesis. The prosthesis may be a tooth from which the root has been removed and replaced with a biocompatible, biologically inert material, e.g., as typically is replaced in a root canal procedure, or may be a completely synthetic prosthesis coated, for example, with a porous material to enhance tooth integration in the tooth socket. Useful prosthesis coating materials include collagen fibers, ceramics and metals, such as titanium oxide. The root of the implanted tooth first may be partially demineralized as described below. Alternatively, a clean, mineralized natural tooth or dentin-containing prosthetic tooth may be implanted.

A tooth to be implanted first is obtained, e.g., by loss or removal of a natural tooth from the tooth socket, e.g., using standard tooth extraction means well known to one skilled in the dentistry art. Alternatively, an allogenic tooth may be obtained from a tooth bank. The natural, mineralized tooth or tooth root may be coated as is with a morphogen and implanted as described below. Alternatively, the mineralized, natural tooth root surface first may be scored or scraped to expose dentin tissue beneath the enamel. Natural, mineralized teeth also may be treated briefly with an acidic solution (e.g., sodium citrate, about pH 3.5) to remove a thin external layer, e.g., about 1-5 cells in thickness from at least the root surface. Preferred treatment times are from about 0.5 to 5 minutes. The treated teeth preferably then are washed, dried and coated with morphogen as described below. Alternatively, the tooth root portion may be at least partially demineralized according to any conventional procedure prior to implantation. A currently preferred demineralization method is to soak the tooth in a demineralizing solution for a length of time sufficient to remove at least some mineral components from the tooth. For example, at least the root portion of the tooth may be placed in a volume, e.g., 0.025-1 liter of a demineralizing agent such as hydrochloric acid (HCl) at a cool temperature for a time sufficient to achieve partial demineralization, e.g., 0.5-0.6M HCl at 4° C. for a prescribed number of minutes (e.g., preferably within the range of about 10-200 minutes.) Essentially complete demineralization may be achieved by acid exposure for 1-7 days. If desired, several changes of the demineralizing agent may be performed. The partially demineralized tooth will be of the same shape as prior to demineralization, but will weigh less due to the absence of the mineral content. The tooth then may be dried by lyophilization.

The tooth or tooth prosthesis may be treated with morphogenic protein as follows. The morphogen may be applied to the tooth or tooth prosthesis root surface by any means known in the art for adsorbing a protein to a surface. A currently preferred method is to suspend the morphogen in a small volume sufficient to cover the tooth surface, e.g., 200-300 μl, freeze the tooth in solution, and then lyophilize the frozen liquid. A currently preferred solution is ethanol (e.g. 50%) or acetonitrile/trifluroactic acid (TFA), other solutions include HCL/TFA, buffered saline, and the like. Alternatively, or in addition, the therapeutic agent may be provided to the tooth root surface dispersed in a suitable carrier material as described above. Similarly, and as described above, the therapeutic agent may be provided to the tooth socket surface and the tooth to be implanted embedded in the morphogen composition on the socket surface. Also as described above, the morphogen may be provided to the tooth root surface in admixture with one or more cofactors.

The tooth then is implanted into a fresh or surgically prepared tooth socket. A surgically prepared surface is prepared by extracting the tooth and removing any scar or other undesired fibrous tissue built up in the socket by standard mechanical and/or chemical procedures well known on the surgical and dental arts. The tooth then is implanted in the site using standard dental and surgical procedures.

The implanted tooth is allowed to grow in the prepared socket for a time sufficient to allow the periodontium to regenerate, e.g., one to several months. The integrity and health of the integrated tooth then may be assessed by a dentist by radiography and visual examination.

For experimental purposes, the integration of an implanted tooth following morphogen treatment can be assessed for integrity and health by removing the entire mandibular area, including the tooth socket and tooth, and examining cross sections of the mandibular area. 5-10 μm cross sections may be prepared for histological evaluation by standard histology procedures, e.g., fixing tissue with formalin, preparing sections for slides and staining with eosin and hematoxylin. The growth and integrity of hard tissues, such as bone, cementum and dentin, also can evaluated radiographically.

Finally, and as described in detail in U.S. Ser. No. 752,674 and in Example 2 below, the morphogens of this invention also induce dentin tissue morphogenesis when provided to an area of lost or damaged dentin. Accordingly, using the procedures described herein and in U.S. Ser. No. 752,674, the morphogen described herein also may be used to repair and regenerate damaged and/or lost dentin tissue in an implanted tooth.

IV. EXAMPLES Example 1 Experimental Regeneration of Peridontium in a Dog Model

The following experiment demonstrates successful integration of an implanted demineralized, protein-extracted morpohgen-treated tooth in a mammal. Premolar teeth were extracted from a dog and divided into three experimental groups: (a) demineralized teeth; (b) demineralized and guanidine extracted teeth; and (c) demineralized, guanidine extracted, and morphogen-treated teeth. Teeth from each group were tested in "fresh" sockets, e.g., tooth sockets from which the teeth had just been removed, as well as surgically prepared sockets, e.g., sockets from which teeth had been extracted 2 months previously and in which scar tissue had formed. These "healed" sockets were surgically prepared for tooth implantation by removing (e.g., by scraping) scar tissue build up to reveal fresh alveolar bone.

The teeth from all three groups were completely demineralized by placing them in 4 liters of 0.5M HCl at 4° C. for 5 days. The 0.5M HCl solution was changed every 24 hours during the 5 day period. The teeth then were washed in 4 liters of deionized water at 4° C. for 5 days. The water solution was also changed every 24 hours during the 5 day period. Teeth from group (a) then were lyophilized until dry and set aside and maintained at 4° C. until ready for use.

Teeth from groups (b) and (c) then were protein-extracted by multiple extractions in 6M quanidine Hcl, followed by washes with distilled water. Specifically, the teeth were placed in in 2-4 liters of 6M guanidine-HCl/Tris HCl pH 7.0 at 4° C. for 72 hours; then washed and further extracted in 200 ml of the guanidine-HCl solution for 4 hours. The teeth were washed again with 4 liters of distilled dH₂ O at 4° C. for 48 hours, and 4 liters of dH₂ O for an additional 12 hours with 3 changes of dH₂ O. The teeth were then lyophilized until dry. Teeth from group (b) were then set aside and maintained at 4° C. until ready for use.

Teeth from group (c) then were treated with the morphogen OP-1 as follows. 1.15 mg of OP-1 was resuspended in 4 ml of 47.5% ethanol/0.09% trifluoroacetic acid (TFA). The concentration was determined to be 0.273 mg/ml. Approximately 50 μg of OP-1 (183 μl of the OP-1 solution) was dispensed into an eppendorf tube, and the total volume brought to 300 μl of 47.5% ethanol/0.09% TFA. Each tooth then was placed in an eppendorf tube such that the OP-1 solution just covered the tooth. The tube was placed at ⁻ 70° C. until the OP-1 solution was frozen, and lyophilized until dry. During lyophilization, care was taken to keep the tube cold. Approximately 50-70% of the OP-1 can be expected to remain in or on the tooth after lyophilization.

The teeth from each of groups (a), (b), and (c) were then implanted into a freshly prepared tooth socket or surgically prepared socket using standard dental surgery procedures known in the art.

The implanted teeth in all three groups were allowed to remain in the socket for two months. The dog then was sacrificed, the mandible cross-sectioned and x-rayed, and histology performed. The results are described below and follows.

Ankylosis formed in the group (a) implants, where demineralized tooth matrix was implanted alone. Cross-sections of the group (a) mandible revealed that the demineralized tooth was surrounded by bone directly attaching to the root or dentin surface. In addition, there was little new tissue growth between the tooth and the bone. Representative histology is illustrated in the photomicrograph of FIG. 2A where bone tissue 14 grows directly into dental tissue 22 in the implanted tooth.

In the group (b) implants, cross-sections revealed formation of unorganized fibrous tissue around the implanted demineralized, guanidine extracted tooth. The periodontal ligament was loose and disorganized, as was the surrounding bony tissue. Examination of the tooth root surface where cementum matrix normally appears revealed resorption of cementum in the upper coronal surface of the tooth. Histological sections also revealed inflammation as evidenced by the presence of macrophages.

As is evident in FIG. 2b, group (c) implant cross-sections revealed formation of newly formed, organized cementum 24 and periodontal ligament tissue 26 around the morphogen-treated tooth matrix, and growth of new bone connecting the newly formed periodontium to the mandible. The tooth was firmly anchored in the tooth socket. The tissues surrounding the tooth, i.e., the newly-formed cementum growing perpendicular to the newly-formed periodontal ligament, and the alveolar bony tissue, all were healthy and organized much as the tooth and tooth socket shown schematically in FIG. 1. The newly-formed cementum comprised immature columnar cell layers which were beginning to flatten into mature cementoblasts, and the newly-formed periodontal ligament comprised a thick layer of tissue to anchor and cushion the tooth within the tooth socket.

The results of this experiment demonstrate that morphogens promote tooth integration into a tooth socket, and induce morphogenesis of periodontium, including morphogenesis of the regeneration and formation of the periodontium, new cementum and periodontal ligament.

Without being limited to any particular theory, the morphogens may act in the tooth socket environment by inducing a differentiation of primary fibroblasts on the alveolar surface to differentiate into cementoblasts which then induct other primary fibroblasts to form periodontal ligament.

Example 2 Morphogen-Induced Dentinogenesis

The example presented below demonstrates the efficacy of morphogens in inducing dentin tissue morphogenesis in an animal model. Further details of the experiment and the implications of this biological activity of morphogens are diclosed in U.S. Ser. No. 752,674.

To date, the unpredictable response of dental pulp tissue to injury is a basic clinical problem in dentistry. Cynomolgus monkeys were chosen as primate models as monkeys are presumed to be more indicative of human dental biology than models based on lower non-primate mammals.

Using standard dental surgical procedures, small areas (e.g., 2 mm) of dental pulps were surgically exposed by removing the enamel and dentin immediately above the pulp (by drilling) of sample teeth, performing a partial amputation of the coronal pulp tissue, inducing hemostasis, application of the pulp treatment, and sealing and filling the cavity by standard procedures.

Pulp treatments used were: OP-1 dispersed in a carrier matrix; carrier matrix alone and no treatment. Twelve teeth per animal (four for each treatment) were prepared, and two animals were used. At four weeks, teeth were extracted and processed histologically for analysis of dentin formation, and/or ground to analyze dentin mineralization. Morphogen treatment produced dramatic effects: Control treatments with carrier alone (PBS) and showed little or no reparation of the lost tissue. By contrast, morphogen-treated teeth showed significant dentin tissue formation in the area where dentin tissue had been surgically removed. The experimental results show that morphogen treatment reliably induced formation of reparative or osteodentin bridges on surgically exposed healthy dental pulps. By contrast, pulps treated with carrier matrix alone, or not treated, failed to form reparative dentin.

Example 3 Screening Assay for Candidate Compounds which Alter Endogenous Morphogen Levels

Candidate compound(s) which may be administered to affect the level of a given morphogen hay be found using the following screening assay, in which the level of morphogen production by a cell type which produces measurable levels of the morphogen is determined with and without incubating the cell in culture with the compound, in order to assess the effects of the compound on the cell. This can be accomplished by detection of the morphogen either at the protein or RNA level. A more detailed description also may be found in U.S. Ser. No. 752,861, incorporated hereinabove by reference.

3.1 Growth of Cells in Culture

Cell cultures of kidney, adrenals, urinary bladder, brain, or other organs, may be prepared as described widely in the literature. For example, kidneys may be explanted from neonatal or new born or young or adult rodents (mouse or rat) and used in organ culture as whole or sliced (1--4 mm) tissues. Primary tissue cultures and established cell lines, also derived from kidney, adrenals, urinary, bladder, brain, mammary, or other tissues may be established in multiwell plates (6 well or 24 well) according to conventional cell culture techniques, and are cultured in the absence or presence of serum for a period of time (1-7 days). Cells may be cultured, for example, in Dulbecco's Modified Eagle medium (Gibco, Long Island, N.Y.) containing serum (e.g., fetal calf serum at 1%-10%, Gibco) or in serum-deprived medium, as desired, or in defined medium (e.g., containing insulin, transferrin, glucose, albumin, or other growth factors).

Samples for testing the level of morphogen production includes culture supernatants or cell lysates, collected periodically and evaluated for OP-1 production by immunoblot analysis (Sambrook et al., eds., 1989, Molecular Cloning, Cold Spring Harbor Press, Cold Spring Harbor, N.Y.), or a portion of the cell culture itself, collected periodically and used to prepare polyA+ RNA for RNA analysis. To monitor de novo OP-1 synthesis, some cultures are labeled according to conventional procedures with an ³⁵ S-methionine/³⁵ S-cysteine mixture for 6-24 hours and then evaluated for OP-1 synthesis by conventional immunoprecipitation methods.

3.2 Determination of Level of Morphogenic Protein

In order to quantitate the production of a morphogenic protein by a cell type, an immunoassay may be performed to detect the morphogen using a polyclonal or monoclonal antibody specific for that protein. For example, OP-1 may be detected using a polyclonal antibody specific for OP-1 in an ELISA, as follows.

1 μg/100 μl of affinity-purified polyclonal rabbit IgG specific for OP-1 is added to each well of a 96-well plate and incubated at 37° C. for an hour. The wells are washed four times with 0.167M sodium borate buffer with 0.15M NaCl (BSB), pH 8.2, containing 0.1% Tween 20. To minimize non-specific binding, the wells are blocked by filling completely with 1% bovine serum albumin (BSA) in BSB and incubating for 1 hour at 37° C. The wells are then washed four times with BSB containing 0.1% Tween 20. A 100 μl aliquot of an appropriate dilution of each of the test samples of cell culture supernatant is added to each well in triplicate and incubated at 37° C. for 30 min. After incubation, 100 μl biotinylated rabbit anti-OP-1 serum (stock solution is about 1 mg/ml and diluted 1:400 in BSB containing 1% BSA before use) is added to each well and incubated at 37° C. for 30 min. The wells are then washed four times with BSB containing 0.1% Tween 20. 100 μl strepavidin-alkaline (Southern Biotechnology Associates, Inc. Birmingham, Ala., diluted 1:2000 in BSB containing 0.1% Tween 20 before use) is added to each well and incubated at 37° C. for 30 min. The plates are washed four times with 0.5M Tris buffered Saline (TBS), pH 7.2. 50 μl substrate (ELISA Amplification System Kit, Life Technologies, Inc., Bethesda, Md.) is added to each well incubated at room temperature for 15 min. Then, 50 μl amplifier (from the same amplification system kit) is added and incubated for another 15 min at room temperature. The reaction is stopped by the addition of 50 μl 0.3M sulphuric acid. The OD at 490 nm of the solution in each well is recorded. To quantitate OP-1 in culture media, a OP-1 standard curve is performed in parallel with the test samples.

Polyclonal antibody may be prepared as follows. Each rabbit is given a primary immunization of 100 ug/500 μl E. coli produced OP-1 monomer (amino acids 328-431 in SEQ ID NO:5) in 0.1% SDS mixed with 500 μl Complete Freund's Adjuvant. The antigen is injected subcutaneously at multiple sites on the back and flanks of the animal. The rabbit is boosted after a month in the same manner using incomplete Freund's Adjuvant. Test bleeds are taken from the ear vein seven days later. Additional boosts and test bleeds are performed at monthly intervals until antibody against OP-1 is detected in the serum using an ELISA assay. Then, the rabbit is boosted with 100 μg of antigen and bled (15 ml per bleed) at days seven and ten after boosting.

Monoclonal antibody specific for a given morphogen may be prepared as follows. A mouse is given two injections of E. coli produced OP-1 monomer. The first injection contains 100 μg of OP-1 in complete Freund's adjuvant and is given subcutaneously. The second injection contains 50 μg of OP-1 in incomplete adjuvant and is given intraperitoneally. The mouse then receives a total of 230 μg of OP-1 (amino acids 307-431 in SEQ ID NO:5) in four intraperitoneal injections at various times over an eight month period. One week prior to fusion, the mouse is boosted intraperitoneally with 100 μg of OP-1 (307-431) and 30 μg of the N-terminal peptide (Ser₂₉₃ -Asn₃₀₉ -Cys) conjugated through the added cysteine to bovine serum albumin with SMCC crosslinking agent. This boost was repeated five days (IP), four days (IP), three days (IP) and one day (IV) prior to fusion. The mouse spleen cells are then fused to myeloma (e.g., 653) cells at a ratio of 1:1 using PEG 1500 (Boeringer Mannheim), and the cell fusion is plated and screened for OP-1-specific antibodies using OP-1 (307-431) as antigen. The cell fusion and monoclonal screening then are according to standard procedures well described in standard texts widely available in the art.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

    __________________________________________________________________________     SEQUENCE LISTING                                                               (1) GENERAL INFORMATION:                                                       (iii) NUMBER OF SEQUENCES: 33                                                  (2) INFORMATION FOR SEQ ID NO:1:                                               (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 97 amino acids                                                     (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..97                                                            (D) OTHER INFORMATION: /label=GENERIC-SEQ-1                                    /note= "EACH XAA INDICATES ONE OF THE 20 NATURALLY                             OCCURRING L- ISOMER, ALPHA-AMINO ACIDS, OR A                                   DERIVATIVE THEREOF"                                                            (xi) SEQUENCE DESCRIPTION: SEQ ID NO:1:                                        XaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaa                               151015                                                                         XaaXaaXaaXaaXaaXaaXaaXaaCysXaaXaaXaaCysXaaXaaXaa                               202530                                                                         XaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaa                               354045                                                                         XaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaCysCysXaaXaa                               505560                                                                         XaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaa                               65707580                                                                       XaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaCysXaaCys                               859095                                                                         Xaa                                                                            (2) INFORMATION FOR SEQ ID NO:2:                                               (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 97 amino acids                                                     (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..97                                                            (D) OTHER INFORMATION: /label=GENERIC-SEQ-2                                    /note= "EACH XAA INDICATES ONE OF THE 20 NATURALLY                             OCCURING L-ISOMER, ALPHA-AMINO ACIDS, OR A                                     DERIVATIVE THEREOF"                                                            (xi) SEQUENCE DESCRIPTION: SEQ ID NO:2:                                        XaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaa                               151015                                                                         XaaXaaXaaXaaXaaXaaXaaXaaCysXaaXaaXaaCysXaaXaaXaa                               202530                                                                         XaaXaaXaaCysXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaa                               354045                                                                         XaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaCysCysXaaXaa                               505560                                                                         XaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaa                               65707580                                                                       XaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaCysXaaCys                               859095                                                                         Xaa                                                                            (2) INFORMATION FOR SEQ ID NO:3:                                               (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 97 amino acids                                                     (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..97                                                            (D) OTHER INFORMATION: /label=GENERIC-SEQ-3                                    /note= "WHEREIN EACH XAA IS INDEPENDENTLY SELECTED FROM                        A GROUP OF ONE OR MORE SPECIFIED AMINO ACIDS AS DEFINED                        IN THE SPECIFICATION "                                                         (xi) SEQUENCE DESCRIPTION: SEQ ID NO:3:                                        LeuTyrValXaaPheXaaXaaXaaGlyTrpXaaXaaTrpXaaXaaAla                               151015                                                                         ProXaaGlyXaaXaaAlaXaaTyrCysXaaGlyXaaCysXaaXaaPro                               202530                                                                         XaaXaaXaaXaaXaaXaaXaaXaaAsnHisAlaXaaXaaXaaXaaLeu                               354045                                                                         XaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaCysCysXaaPro                               505560                                                                         XaaXaaXaaXaaXaaXaaXaaXaaLeuXaaXaaXaaXaaXaaXaaXaa                               65707580                                                                       ValXaaLeuXaaXaaXaaXaaXaaMetXaaValXaaXaaCysGlyCys                               859095                                                                         Xaa                                                                            (2) INFORMATION FOR SEQ ID NO:4:                                               (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 102 amino acids                                                    (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..102                                                           (D) OTHER INFORMATION: /label=GENERIC-SEQ-4                                    /note= "WHEREIN EACH XAA IS INDEPENDENTLY SELECTED FROM                        A GROUP OF ONE OR MORE SPECIFIED AMINO ACIDS AS DEFINED                        IN THE SPECIFICATION"                                                          (xi) SEQUENCE DESCRIPTION: SEQ ID NO:4:                                        CysXaaXaaXaaXaaLeuTyrValXaaPheXaaXaaXaaGlyTrpXaa                               151015                                                                         XaaTrpXaaXaaAlaProXaaGlyXaaXaaAlaXaaTyrCysXaaGly                               202530                                                                         XaaCysXaaXaaProXaaXaaXaaXaaXaaXaaXaaXaaAsnHisAla                               354045                                                                         XaaXaaXaaXaaLeuXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaa                               505560                                                                         XaaCysCysXaaProXaaXaaXaaXaaXaaXaaXaaXaaLeuXaaXaa                               65707580                                                                       XaaXaaXaaXaaXaaValXaaLeuXaaXaaXaaXaaXaaMetXaaVal                               859095                                                                         XaaXaaCysGlyCysXaa                                                             100                                                                            (2) INFORMATION FOR SEQ ID NO:5:                                               (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 139 amino acids                                                    (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..139                                                           (D) OTHER INFORMATION: /note= "HOP-1 (MATURE FORM)"                            (xi) SEQUENCE DESCRIPTION: SEQ ID NO:5:                                        SerThrGlySerLysGlnArgSerGlnAsnArgSerLysThrProLys                               151015                                                                         AsnGlnGluAlaLeuArgMetAlaAsnValAlaGluAsnSerSerSer                               202530                                                                         AspGlnArgGlnAlaCysLysLysHisGluLeuTyrValSerPheArg                               354045                                                                         AspLeuGlyTrpGlnAspTrpIleIleAlaProGluGlyTyrAlaAla                               505560                                                                         TyrTyrCysGluGlyGluCysAlaPheProLeuAsnSerTyrMetAsn                               65707580                                                                       AlaThrAsnHisAlaIleValGlnThrLeuValHisPheIleAsnPro                               859095                                                                         GluThrValProLysProCysCysAlaProThrGlnLeuAsnAlaIle                               100105110                                                                      SerValLeuTyrPheAspAspSerSerAsnValIleLeuLysLysTyr                               115120125                                                                      ArgAsnMetValValArgAlaCysGlyCysHis                                              130135                                                                         (2) INFORMATION FOR SEQ ID NO:6:                                               (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 139 amino acids                                                    (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..139                                                           (D) OTHER INFORMATION: /note= "MOP-1 (MATURE FORM)"                            (xi) SEQUENCE DESCRIPTION: SEQ ID NO:6:                                        SerThrGlyGlyLysGlnArgSerGlnAsnArgSerLysThrProLys                               151015                                                                         AsnGlnGluAlaLeuArgMetAlaSerValAlaGluAsnSerSerSer                               202530                                                                         AspGlnArgGlnAlaCysLysLysHisGluLeuTyrValSerPheArg                               354045                                                                         AspLeuGlyTrpGlnAspTrpIleIleAlaProGluGlyTyrAlaAla                               505560                                                                         TyrTyrCysGluGlyGluCysAlaPheProLeuAsnSerTyrMetAsn                               65707580                                                                       AlaThrAsnHisAlaIleValGlnThrLeuValHisPheIleAsnPro                               859095                                                                         AspThrValProLysProCysCysAlaProThrGlnLeuAsnAlaIle                               100105110                                                                      SerValLeuTyrPheAspAspSerSerAsnValIleLeuLysLysTyr                               115120125                                                                      ArgAsnMetValValArgAlaCysGlyCysHis                                              130135                                                                         (2) INFORMATION FOR SEQ ID NO:7:                                               (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 139 amino acids                                                    (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..139                                                           (D) OTHER INFORMATION: /note= "HOP-2 (MATURE FORM)"                            (xi) SEQUENCE DESCRIPTION: SEQ ID NO:7:                                        AlaValArgProLeuArgArgArgGlnProLysLysSerAsnGluLeu                               151015                                                                         ProGlnAlaAsnArgLeuProGlyIlePheAspAspValHisGlySer                               202530                                                                         HisGlyArgGlnValCysArgArgHisGluLeuTyrValSerPheGln                               354045                                                                         AspLeuGlyTrpLeuAspTrpValIleAlaProGlnGlyTyrSerAla                               505560                                                                         TyrTyrCysGluGlyGluCysSerPheProLeuAspSerCysMetAsn                               65707580                                                                       AlaThrAsnHisAlaIleLeuGlnSerLeuValHisLeuMetLysPro                               859095                                                                         AsnAlaValProLysAlaCysCysAlaProThrLysLeuSerAlaThr                               100105110                                                                      SerValLeuTyrTyrAspSerSerAsnAsnValIleLeuArgLysHis                               115120125                                                                      ArgAsnMetValValLysAlaCysGlyCysHis                                              130135                                                                         (2) INFORMATION FOR SEQ ID NO:8:                                               (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 139 amino acids                                                    (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..139                                                           (D) OTHER INFORMATION: /note= "MOP-2 (MATURE FORM)"                            (xi) SEQUENCE DESCRIPTION: SEQ ID NO:8:                                        AlaAlaArgProLeuLysArgArgGlnProLysLysThrAsnGluLeu                               151015                                                                         ProHisProAsnLysLeuProGlyIlePheAspAspGlyHisGlySer                               202530                                                                         ArgGlyArgGluValCysArgArgHisGluLeuTyrValSerPheArg                               354045                                                                         AspLeuGlyTrpLeuAspTrpValIleAlaProGlnGlyTyrSerAla                               505560                                                                         TyrTyrCysGluGlyGluCysAlaPheProLeuAspSerCysMetAsn                               65707580                                                                       AlaThrAsnHisAlaIleLeuGlnSerLeuValHisLeuMetLysPro                               859095                                                                         AspValValProLysAlaCysCysAlaProThrLysLeuSerAlaThr                               100105110                                                                      SerValLeuTyrTyrAspSerSerAsnAsnValIleLeuArgLysHis                               115120125                                                                      ArgAsnMetValValLysAlaCysGlyCysHis                                              130135                                                                         (2) INFORMATION FOR SEQ ID NO:9:                                               (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 101 amino acids                                                    (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..101                                                           (D) OTHER INFORMATION: /note= "CBMP-2A(FX)"                                    (xi) SEQUENCE DESCRIPTION: SEQ ID NO:9:                                        CysLysArgHisProLeuTyrValAspPheSerAspValGlyTrpAsn                               151015                                                                         AspTrpIleValAlaProProGlyTyrHisAlaPheTyrCysHisGly                               202530                                                                         GluCysProPheProLeuAlaAspHisLeuAsnSerThrAsnHisAla                               354045                                                                         IleValGlnThrLeuValAsnSerValAsnSerLysIleProLysAla                               505560                                                                         CysCysValProThrGluLeuSerAlaIleSerMetLeuTyrLeuAsp                               65707580                                                                       GluAsnGluLysValValLeuLysAsnTyrGlnAspMetValValGlu                               859095                                                                         GlyCysGlyCysArg                                                                100                                                                            (2) INFORMATION FOR SEQ ID NO:10:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 101 amino acids                                                    (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..101                                                           (D) OTHER INFORMATION: /note= "CBMP-2B(FX)"                                    (xi) SEQUENCE DESCRIPTION: SEQ ID NO:10:                                       CysArgArgHisSerLeuTyrValAspPheSerAspValGlyTrpAsn                               151015                                                                         AspTrpIleValAlaProProGlyTyrGlnAlaPheTyrCysHisGly                               202530                                                                         AspCysProPheProLeuAlaAspHisLeuAsnSerThrAsnHisAla                               354045                                                                         IleValGlnThrLeuValAsnSerValAsnSerSerIleProLysAla                               505560                                                                         CysCysValProThrGluLeuSerAlaIleSerMetLeuTyrLeuAsp                               65707580                                                                       GluTyrAspLysValValLeuLysAsnTyrGlnGluMetValValGlu                               859095                                                                         GlyCysGlyCysArg                                                                100                                                                            (2) INFORMATION FOR SEQ ID NO:11:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 102 amino acids                                                    (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..102                                                           (D) OTHER INFORMATION: /note= "DPP(FX)"                                        (xi) SEQUENCE DESCRIPTION: SEQ ID NO:11:                                       CysArgArgHisSerLeuTyrValAspPheSerAspValGlyTrpAsp                               151015                                                                         AspTrpIleValAlaProLeuGlyTyrAspAlaTyrTyrCysHisGly                               202530                                                                         LysCysProPheProLeuAlaAspHisPheAsnSerThrAsnHisAla                               354045                                                                         ValValGlnThrLeuValAsnAsnAsnAsnProGlyLysValProLys                               505560                                                                         AlaCysCysValProThrGlnLeuAspSerValAlaMetLeuTyrLeu                               65707580                                                                       AsnAspGlnSerThrValValLeuLysAsnTyrGlnGluMetThrVal                               859095                                                                         ValGlyCysGlyCysArg                                                             100                                                                            (2) INFORMATION FOR SEQ ID NO:12:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 102 amino acids                                                    (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..102                                                           (D) OTHER INFORMATION: /note= "VGL(FX)"                                        (xi) SEQUENCE DESCRIPTION: SEQ ID NO:12:                                       CysLysLysArgHisLeuTyrValGluPheLysAspValGlyTrpGln                               151015                                                                         AsnTrpValIleAlaProGlnGlyTyrMetAlaAsnTyrCysTyrGly                               202530                                                                         GluCysProTyrProLeuThrGluIleLeuAsnGlySerAsnHisAla                               354045                                                                         IleLeuGlnThrLeuValHisSerIleGluProGluAspIleProLeu                               505560                                                                         ProCysCysValProThrLysMetSerProIleSerMetLeuPheTyr                               65707580                                                                       AspAsnAsnAspAsnValValLeuArgHisTyrGluAsnMetAlaVal                               859095                                                                         AspGluCysGlyCysArg                                                             100                                                                            (2) INFORMATION FOR SEQ ID NO:13:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 102 amino acids                                                    (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..102                                                           (D) OTHER INFORMATION: /note= "VGR-1(FX)"                                      (xi) SEQUENCE DESCRIPTION: SEQ ID NO:13:                                       CysLysLysHisGluLeuTyrValSerPheGlnAspValGlyTrpGln                               151015                                                                         AspTrpIleIleAlaProLysGlyTyrAlaAlaAsnTyrCysAspGly                               202530                                                                         GluCysSerPheProLeuAsnAlaHisMetAsnAlaThrAsnHisAla                               354045                                                                         IleValGlnThrLeuValHisValMetAsnProGluTyrValProLys                               505560                                                                         ProCysCysAlaProThrLysValAsnAlaIleSerValLeuTyrPhe                               65707580                                                                       AspAspAsnSerAsnValIleLeuLysLysTyrArgAsnMetValVal                               859095                                                                         ArgAlaCysGlyCysHis                                                             100                                                                            (2) INFORMATION FOR SEQ ID NO:14:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 106 amino acids                                                    (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..106                                                           (D) OTHER INFORMATION: /note= "GDF-1 (FX)"                                     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:14:                                       CysArgAlaArgArgLeuTyrValSerPheArgGluValGlyTrpHis                               151015                                                                         ArgTrpValIleAlaProArgGlyPheLeuAlaAsnTyrCysGlnGly                               202530                                                                         GlnCysAlaLeuProValAlaLeuSerGlySerGlyGlyProProAla                               354045                                                                         LeuAsnHisAlaValLeuArgAlaLeuMetHisAlaAlaAlaProGly                               505560                                                                         AlaAlaAspLeuProCysCysValProAlaArgLeuSerProIleSer                               65707580                                                                       ValLeuPhePheAspAsnSerAspAsnValValLeuArgGlnTyrGlu                               859095                                                                         AspMetValValAspGluCysGlyCysArg                                                 100105                                                                         (2) INFORMATION FOR SEQ ID NO:15:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 5 amino acids                                                      (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: peptide                                                    (xi) SEQUENCE DESCRIPTION: SEQ ID NO:15:                                       CysXaaXaaXaaXaa                                                                15                                                                             (2) INFORMATION FOR SEQ ID NO:16:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 1822 base pairs                                                    (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: cDNA                                                       (ix) FEATURE:                                                                  (A) NAME/KEY: CDS                                                              (B) LOCATION: 49..1341                                                         (D) OTHER INFORMATION: /product="HOP-1"                                        (xi) SEQUENCE DESCRIPTION: SEQ ID NO:16:                                       GGTGCGGGCCCGGAGCCCGGAGCCCGGGTAGCGCGTAGAGCCGGCGCGATGCACGTG57                    MetHisVal                                                                      CGCTCACTGCGAGCTGCGGCGCCGCACAGCTTCGTGGCGCTCTGGGCA105                            ArgSerLeuArgAlaAlaAlaProHisSerPheValAlaLeuTrpAla                               51015                                                                          CCCCTGTTCCTGCTGCGCTCCGCCCTGGCCGACTTCAGCCTGGACAAC153                            ProLeuPheLeuLeuArgSerAlaLeuAlaAspPheSerLeuAspAsn                               20253035                                                                       GAGGTGCACTCGAGCTTCATCCACCGGCGCCTCCGCAGCCAGGAGCGG201                            GluValHisSerSerPheIleHisArgArgLeuArgSerGlnGluArg                               404550                                                                         CGGGAGATGCAGCGCGAGATCCTCTCCATTTTGGGCTTGCCCCACCGC249                            ArgGluMetGlnArgGluIleLeuSerIleLeuGlyLeuProHisArg                               556065                                                                         CCGCGCCCGCACCTCCAGGGCAAGCACAACTCGGCACCCATGTTCATG297                            ProArgProHisLeuGlnGlyLysHisAsnSerAlaProMetPheMet                               707580                                                                         CTGGACCTGTACAACGCCATGGCGGTGGAGGAGGGCGGCGGGCCCGGC345                            LeuAspLeuTyrAsnAlaMetAlaValGluGluGlyGlyGlyProGly                               859095                                                                         GGCCAGGGCTTCTCCTACCCCTACAAGGCCGTCTTCAGTACCCAGGGC393                            GlyGlnGlyPheSerTyrProTyrLysAlaValPheSerThrGlnGly                               100105110115                                                                   CCCCCTCTGGCCAGCCTGCAAGATAGCCATTTCCTCACCGACGCCGAC441                            ProProLeuAlaSerLeuGlnAspSerHisPheLeuThrAspAlaAsp                               120125130                                                                      ATGGTCATGAGCTTCGTCAACCTCGTGGAACATGACAAGGAATTCTTC489                            MetValMetSerPheValAsnLeuValGluHisAspLysGluPhePhe                               135140145                                                                      CACCCACGCTACCACCATCGAGAGTTCCGGTTTGATCTTTCCAAGATC537                            HisProArgTyrHisHisArgGluPheArgPheAspLeuSerLysIle                               150155160                                                                      CCAGAAGGGGAAGCTGTCACGGCAGCCGAATTCCGGATCTACAAGGAC585                            ProGluGlyGluAlaValThrAlaAlaGluPheArgIleTyrLysAsp                               165170175                                                                      TACATCCGGGAACGCTTCGACAATGAGACGTTCCGGATCAGCGTTTAT633                            TyrIleArgGluArgPheAspAsnGluThrPheArgIleSerValTyr                               180185190195                                                                   CAGGTGCTCCAGGAGCACTTGGGCAGGGAATCGGATCTCTTCCTGCTC681                            GlnValLeuGlnGluHisLeuGlyArgGluSerAspLeuPheLeuLeu                               200205210                                                                      GACAGCCGTACCCTCTGGGCCTCGGAGGAGGGCTGGCTGGTGTTTGAC729                            AspSerArgThrLeuTrpAlaSerGluGluGlyTrpLeuValPheAsp                               215220225                                                                      ATCACAGCCACCAGCAACCACTGGGTGGTCAATCCGCGGCACAACCTG777                            IleThrAlaThrSerAsnHisTrpValValAsnProArgHisAsnLeu                               230235240                                                                      GGCCTGCAGCTCTCGGTGGAGACGCTGGATGGGCAGAGCATCAACCCC825                            GlyLeuGlnLeuSerValGluThrLeuAspGlyGlnSerIleAsnPro                               245250255                                                                      AAGTTGGCGGGCCTGATTGGGCGGCACGGGCCCCAGAACAAGCAGCCC873                            LysLeuAlaGlyLeuIleGlyArgHisGlyProGlnAsnLysGlnPro                               260265270275                                                                   TTCATGGTGGCTTTCTTCAAGGCCACGGAGGTCCACTTCCGCAGCATC921                            PheMetValAlaPhePheLysAlaThrGluValHisPheArgSerIle                               280285290                                                                      CGGTCCACGGGGAGCAAACAGCGCAGCCAGAACCGCTCCAAGACGCCC969                            ArgSerThrGlySerLysGlnArgSerGlnAsnArgSerLysThrPro                               295300305                                                                      AAGAACCAGGAAGCCCTGCGGATGGCCAACGTGGCAGAGAACAGCAGC1017                           LysAsnGlnGluAlaLeuArgMetAlaAsnValAlaGluAsnSerSer                               310315320                                                                      AGCGACCAGAGGCAGGCCTGTAAGAAGCACGAGCTGTATGTCAGCTTC1065                           SerAspGlnArgGlnAlaCysLysLysHisGluLeuTyrValSerPhe                               325330335                                                                      CGAGACCTGGGCTGGCAGGACTGGATCATCGCGCCTGAAGGCTACGCC1113                           ArgAspLeuGlyTrpGlnAspTrpIleIleAlaProGluGlyTyrAla                               340345350355                                                                   GCCTACTACTGTGAGGGGGAGTGTGCCTTCCCTCTGAACTCCTACATG1161                           AlaTyrTyrCysGluGlyGluCysAlaPheProLeuAsnSerTyrMet                               360365370                                                                      AACGCCACCAACCACGCCATCGTGCAGACGCTGGTCCACTTCATCAAC1209                           AsnAlaThrAsnHisAlaIleValGlnThrLeuValHisPheIleAsn                               375380385                                                                      CCGGAAACGGTGCCCAAGCCCTGCTGTGCGCCCACGCAGCTCAATGCC1257                           ProGluThrValProLysProCysCysAlaProThrGlnLeuAsnAla                               390395400                                                                      ATCTCCGTCCTCTACTTCGATGACAGCTCCAACGTCATCCTGAAGAAA1305                           IleSerValLeuTyrPheAspAspSerSerAsnValIleLeuLysLys                               405410415                                                                      TACAGAAACATGGTGGTCCGGGCCTGTGGCTGCCACTAGCTCCTCC1351                             TyrArgAsnMetValValArgAlaCysGlyCysHis                                           420425430                                                                      GAGAATTCAGACCCTTTGGGGCCAAGTTTTTCTGGATCCTCCATTGCTCGCCTTGGCCAG1411               GAACCAGCAGACCAACTGCCTTTTGTGAGACCTTCCCCTCCCTATCCCCAACTTTAAAGG1471               TGTGAGAGTATTAGGAAACATGAGCAGCATATGGCTTTTGATCAGTTTTTCAGTGGCAGC1531               ATCCAATGAACAAGATCCTACAAGCTGTGCAGGCAAAACCTAGCAGGAAAAAAAAACAAC1591               GCATAAAGAAAAATGGCCGGGCCAGGTCATTGGCTGGGAAGTCTCAGCCATGCACGGACT1651               CGTTTCCAGAGGTAATTATGAGCGCCTACCAGCCAGGCCACCCAGCCGTGGGAGGAAGGG1711               GGCGTGGCAAGGGGTGGGCACATTGGTGTCTGTGCGAAAGGAAAATTGACCCGGAAGTTC1771               CTGTAATAAATGTCACAATAAAACGAATGAATGAAAAAAAAAAAAAAAAAA1822                        (2) INFORMATION FOR SEQ ID NO:17:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 431 amino acids                                                    (B) TYPE: amino acid                                                           (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (xi) SEQUENCE DESCRIPTION: SEQ ID NO:17:                                       MetHisValArgSerLeuArgAlaAlaAlaProHisSerPheValAla                               151015                                                                         LeuTrpAlaProLeuPheLeuLeuArgSerAlaLeuAlaAspPheSer                               202530                                                                         LeuAspAsnGluValHisSerSerPheIleHisArgArgLeuArgSer                               354045                                                                         GlnGluArgArgGluMetGlnArgGluIleLeuSerIleLeuGlyLeu                               505560                                                                         ProHisArgProArgProHisLeuGlnGlyLysHisAsnSerAlaPro                               65707580                                                                       MetPheMetLeuAspLeuTyrAsnAlaMetAlaValGluGluGlyGly                               859095                                                                         GlyProGlyGlyGlnGlyPheSerTyrProTyrLysAlaValPheSer                               100105110                                                                      ThrGlnGlyProProLeuAlaSerLeuGlnAspSerHisPheLeuThr                               115120125                                                                      AspAlaAspMetValMetSerPheValAsnLeuValGluHisAspLys                               130135140                                                                      GluPhePheHisProArgTyrHisHisArgGluPheArgPheAspLeu                               145150155160                                                                   SerLysIleProGluGlyGluAlaValThrAlaAlaGluPheArgIle                               165170175                                                                      TyrLysAspTyrIleArgGluArgPheAspAsnGluThrPheArgIle                               180185190                                                                      SerValTyrGlnValLeuGlnGluHisLeuGlyArgGluSerAspLeu                               195200205                                                                      PheLeuLeuAspSerArgThrLeuTrpAlaSerGluGluGlyTrpLeu                               210215220                                                                      ValPheAspIleThrAlaThrSerAsnHisTrpValValAsnProArg                               225230235240                                                                   HisAsnLeuGlyLeuGlnLeuSerValGluThrLeuAspGlyGlnSer                               245250255                                                                      IleAsnProLysLeuAlaGlyLeuIleGlyArgHisGlyProGlnAsn                               260265270                                                                      LysGlnProPheMetValAlaPhePheLysAlaThrGluValHisPhe                               275280285                                                                      ArgSerIleArgSerThrGlySerLysGlnArgSerGlnAsnArgSer                               290295300                                                                      LysThrProLysAsnGlnGluAlaLeuArgMetAlaAsnValAlaGlu                               305310315320                                                                   AsnSerSerSerAspGlnArgGlnAlaCysLysLysHisGluLeuTyr                               325330335                                                                      ValSerPheArgAspLeuGlyTrpGlnAspTrpIleIleAlaProGlu                               340345350                                                                      GlyTyrAlaAlaTyrTyrCysGluGlyGluCysAlaPheProLeuAsn                               355360365                                                                      SerTyrMetAsnAlaThrAsnHisAlaIleValGlnThrLeuValHis                               370375380                                                                      PheIleAsnProGluThrValProLysProCysCysAlaProThrGln                               385390395400                                                                   LeuAsnAlaIleSerValLeuTyrPheAspAspSerSerAsnValIle                               405410415                                                                      LeuLysLysTyrArgAsnMetValValArgAlaCysGlyCysHis                                  420425430                                                                      (2) INFORMATION FOR SEQ ID NO:18:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 1873 base pairs                                                    (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: cDNA                                                       (ix) FEATURE:                                                                  (A) NAME/KEY: CDS                                                              (B) LOCATION: 104..1393                                                        (D) OTHER INFORMATION: /product="MOP1 (CDNA)"                                  (xi) SEQUENCE DESCRIPTION: SEQ ID NO:18:                                       CTGCAGCAAGTGACCTCGGGTCGTGGACCGCTGCCCTGCCCCCTCCGCTGCCACCTGGGG60                 CGGCGCGGGCCCGGTGCCCCGGATCGCGCGTAGAGCCGGCGCGATGCACGTGCGC115                     MetHisValArg                                                                   1                                                                              TCGCTGCGCGCTGCGGCGCCACACAGCTTCGTGGCGCTCTGGGCGCCT163                            SerLeuArgAlaAlaAlaProHisSerPheValAlaLeuTrpAlaPro                               5101520                                                                        CTGTTCTTGCTGCGCTCCGCCCTGGCCGATTTCAGCCTGGACAACGAG211                            LeuPheLeuLeuArgSerAlaLeuAlaAspPheSerLeuAspAsnGlu                               253035                                                                         GTGCACTCCAGCTTCATCCACCGGCGCCTCCGCAGCCAGGAGCGGCGG259                            ValHisSerSerPheIleHisArgArgLeuArgSerGlnGluArgArg                               404550                                                                         GAGATGCAGCGGGAGATCCTGTCCATCTTAGGGTTGCCCCATCGCCCG307                            GluMetGlnArgGluIleLeuSerIleLeuGlyLeuProHisArgPro                               556065                                                                         CGCCCGCACCTCCAGGGAAAGCATAATTCGGCGCCCATGTTCATGTTG355                            ArgProHisLeuGlnGlyLysHisAsnSerAlaProMetPheMetLeu                               707580                                                                         GACCTGTACAACGCCATGGCGGTGGAGGAGAGCGGGCCGGACGGACAG403                            AspLeuTyrAsnAlaMetAlaValGluGluSerGlyProAspGlyGln                               859095100                                                                      GGCTTCTCCTACCCCTACAAGGCCGTCTTCAGTACCCAGGGCCCCCCT451                            GlyPheSerTyrProTyrLysAlaValPheSerThrGlnGlyProPro                               105110115                                                                      TTAGCCAGCCTGCAGGACAGCCATTTCCTCACTGACGCCGACATGGTC499                            LeuAlaSerLeuGlnAspSerHisPheLeuThrAspAlaAspMetVal                               120125130                                                                      ATGAGCTTCGTCAACCTAGTGGAACATGACAAAGAATTCTTCCACCCT547                            MetSerPheValAsnLeuValGluHisAspLysGluPhePheHisPro                               135140145                                                                      CGATACCACCATCGGGAGTTCCGGTTTGATCTTTCCAAGATCCCCGAG595                            ArgTyrHisHisArgGluPheArgPheAspLeuSerLysIleProGlu                               150155160                                                                      GGCGAACGGGTGACCGCAGCCGAATTCAGGATCTATAAGGACTACATC643                            GlyGluArgValThrAlaAlaGluPheArgIleTyrLysAspTyrIle                               165170175180                                                                   CGGGAGCGATTTGACAACGAGACCTTCCAGATCACAGTCTATCAGGTG691                            ArgGluArgPheAspAsnGluThrPheGlnIleThrValTyrGlnVal                               185190195                                                                      CTCCAGGAGCACTCAGGCAGGGAGTCGGACCTCTTCTTGCTGGACAGC739                            LeuGlnGluHisSerGlyArgGluSerAspLeuPheLeuLeuAspSer                               200205210                                                                      CGCACCATCTGGGCTTCTGAGGAGGGCTGGTTGGTGTTTGATATCACA787                            ArgThrIleTrpAlaSerGluGluGlyTrpLeuValPheAspIleThr                               215220225                                                                      GCCACCAGCAACCACTGGGTGGTCAACCCTCGGCACAACCTGGGCTTA835                            AlaThrSerAsnHisTrpValValAsnProArgHisAsnLeuGlyLeu                               230235240                                                                      CAGCTCTCTGTGGAGACCCTGGATGGGCAGAGCATCAACCCCAAGTTG883                            GlnLeuSerValGluThrLeuAspGlyGlnSerIleAsnProLysLeu                               245250255260                                                                   GCAGGCCTGATTGGACGGCATGGACCCCAGAACAAGCAACCCTTCATG931                            AlaGlyLeuIleGlyArgHisGlyProGlnAsnLysGlnProPheMet                               265270275                                                                      GTGGCCTTCTTCAAGGCCACGGAAGTCCATCTCCGTAGTATCCGGTCC979                            ValAlaPhePheLysAlaThrGluValHisLeuArgSerIleArgSer                               280285290                                                                      ACGGGGGGCAAGCAGCGCAGCCAGAATCGCTCCAAGACGCCAAAGAAC1027                           ThrGlyGlyLysGlnArgSerGlnAsnArgSerLysThrProLysAsn                               295300305                                                                      CAAGAGGCCCTGAGGATGGCCAGTGTGGCAGAAAACAGCAGCAGTGAC1075                           GlnGluAlaLeuArgMetAlaSerValAlaGluAsnSerSerSerAsp                               310315320                                                                      CAGAGGCAGGCCTGCAAGAAACATGAGCTGTACGTCAGCTTCCGAGAC1123                           GlnArgGlnAlaCysLysLysHisGluLeuTyrValSerPheArgAsp                               325330335340                                                                   CTTGGCTGGCAGGACTGGATCATTGCACCTGAAGGCTATGCTGCCTAC1171                           LeuGlyTrpGlnAspTrpIleIleAlaProGluGlyTyrAlaAlaTyr                               345350355                                                                      TACTGTGAGGGAGAGTGCGCCTTCCCTCTGAACTCCTACATGAACGCC1219                           TyrCysGluGlyGluCysAlaPheProLeuAsnSerTyrMetAsnAla                               360365370                                                                      ACCAACCACGCCATCGTCCAGACACTGGTTCACTTCATCAACCCAGAC1267                           ThrAsnHisAlaIleValGlnThrLeuValHisPheIleAsnProAsp                               375380385                                                                      ACAGTACCCAAGCCCTGCTGTGCGCCCACCCAGCTCAACGCCATCTCT1315                           ThrValProLysProCysCysAlaProThrGlnLeuAsnAlaIleSer                               390395400                                                                      GTCCTCTACTTCGACGACAGCTCTAATGTCATCCTGAAGAAGTACAGA1363                           ValLeuTyrPheAspAspSerSerAsnValIleLeuLysLysTyrArg                               405410415420                                                                   AACATGGTGGTCCGGGCCTGTGGCTGCCACTAGCTCTTCCTGAGACCCTG1413                         AsnMetValValArgAlaCysGlyCysHis                                                 425430                                                                         ACCTTTGCGGGGCCACACCTTTCCAAATCTTCGATGTCTCACCATCTAAGTCTCTCACTG1473               CCCACCTTGGCGAGGAGAACAGACCAACCTCTCCTGAGCCTTCCCTCACCTCCCAACCGG1533               AAGCATGTAAGGGTTCCAGAAACCTGAGCGTGCAGCAGCTGATGAGCGCCCTTTCCTTCT1593               GGCACGTGACGGACAAGATCCTACCAGCTACCACAGCAAACGCCTAAGAGCAGGAAAAAT1653               GTCTGCCAGGAAAGTGTCCAGTGTCCACATGGCCCCTGGCGCTCTGAGTCTTTGAGGAGT1713               AATCGCAAGCCTCGTTCAGCTGCAGCAGAAGGAAGGGCTTAGCCAGGGTGGGCGCTGGCG1773               TCTGTGTTGAAGGGAAACCAAGCAGAAGCCACTGTAATGATATGTCACAATAAAACCCAT1833               GAATGAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGAATTC1873                                   (2) INFORMATION FOR SEQ ID NO:19:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 430 amino acids                                                    (B) TYPE: amino acid                                                           (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (xi) SEQUENCE DESCRIPTION: SEQ ID NO:19:                                       MetHisValArgSerLeuArgAlaAlaAlaProHisSerPheValAla                               151015                                                                         LeuTrpAlaProLeuPheLeuLeuArgSerAlaLeuAlaAspPheSer                               202530                                                                         LeuAspAsnGluValHisSerSerPheIleHisArgArgLeuArgSer                               354045                                                                         GlnGluArgArgGluMetGlnArgGluIleLeuSerIleLeuGlyLeu                               505560                                                                         ProHisArgProArgProHisLeuGlnGlyLysHisAsnSerAlaPro                               65707580                                                                       MetPheMetLeuAspLeuTyrAsnAlaMetAlaValGluGluSerGly                               859095                                                                         ProAspGlyGlnGlyPheSerTyrProTyrLysAlaValPheSerThr                               100105110                                                                      GlnGlyProProLeuAlaSerLeuGlnAspSerHisPheLeuThrAsp                               115120125                                                                      AlaAspMetValMetSerPheValAsnLeuValGluHisAspLysGlu                               130135140                                                                      PhePheHisProArgTyrHisHisArgGluPheArgPheAspLeuSer                               145150155160                                                                   LysIleProGluGlyGluArgValThrAlaAlaGluPheArgIleTyr                               165170175                                                                      LysAspTyrIleArgGluArgPheAspAsnGluThrPheGlnIleThr                               180185190                                                                      ValTyrGlnValLeuGlnGluHisSerGlyArgGluSerAspLeuPhe                               195200205                                                                      LeuLeuAspSerArgThrIleTrpAlaSerGluGluGlyTrpLeuVal                               210215220                                                                      PheAspIleThrAlaThrSerAsnHisTrpValValAsnProArgHis                               225230235240                                                                   AsnLeuGlyLeuGlnLeuSerValGluThrLeuAspGlyGlnSerIle                               245250255                                                                      AsnProLysLeuAlaGlyLeuIleGlyArgHisGlyProGlnAsnLys                               260265270                                                                      GlnProPheMetValAlaPhePheLysAlaThrGluValHisLeuArg                               275280285                                                                      SerIleArgSerThrGlyGlyLysGlnArgSerGlnAsnArgSerLys                               290295300                                                                      ThrProLysAsnGlnGluAlaLeuArgMetAlaSerValAlaGluAsn                               305310315320                                                                   SerSerSerAspGlnArgGlnAlaCysLysLysHisGluLeuTyrVal                               325330335                                                                      SerPheArgAspLeuGlyTrpGlnAspTrpIleIleAlaProGluGly                               340345350                                                                      TyrAlaAlaTyrTyrCysGluGlyGluCysAlaPheProLeuAsnSer                               355360365                                                                      TyrMetAsnAlaThrAsnHisAlaIleValGlnThrLeuValHisPhe                               370375380                                                                      IleAsnProAspThrValProLysProCysCysAlaProThrGlnLeu                               385390395400                                                                   AsnAlaIleSerValLeuTyrPheAspAspSerSerAsnValIleLeu                               405410415                                                                      LysLysTyrArgAsnMetValValArgAlaCysGlyCysHis                                     420425430                                                                      (2) INFORMATION FOR SEQ ID NO:20:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 1723 base pairs                                                    (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: cDNA                                                       (ix) FEATURE:                                                                  (A) NAME/KEY: CDS                                                              (B) LOCATION: 490..1695                                                        (xi) SEQUENCE DESCRIPTION: SEQ ID NO:20:                                       GGCGCCGGCAGAGCAGGAGTGGCTGGAGGAGCTGTGGTTGGAGCAGGAGGTGGCACGGCA60                 GGGCTGGAGGGCTCCCTATGAGTGGCGGAGACGGCCCAGGAGGCGCTGGAGCAACAGCTC120                CCACACCGCACCAAGCGGTGGCTGCAGGAGCTCGCCCATCGCCCCTGCGCTGCTCGGACC180                GCGGCCACAGCCGGACTGGCGGGTACGGCGGCGACAGAGGCATTGGCCGAGAGTCCCAGT240                CCGCAGAGTAGCCCCGGCCTCGAGGCGGTGGCGTCCCGGTCCTCTCCGTCCAGGAGCCAG300                GACAGGTGTCGCGCGGCGGGGCTCCAGGGACCGCGCCTGAGGCCGGCTGCCCGCCCGTCC360                CGCCCCGCCCCGCCGCCCGCCGCCCGCCGAGCCCAGCCTCCTTGCCGTCGGGGCGTCCCC420                AGGCCCTGGGTCGGCCGCGGAGCCGATGCGCGCCCGCTGAGCGCCCCAGCTGAGCGCCCC480                CGGCCTGCCATGACCGCGCTCCCCGGCCCGCTCTGGCTCCTGGGCCTG528                            MetThrAlaLeuProGlyProLeuTrpLeuLeuGlyLeu                                        1510                                                                           GCGCTATGCGCGCTGGGCGGGGGCGGCCCCGGCCTGCGACCCCCGCCC576                            AlaLeuCysAlaLeuGlyGlyGlyGlyProGlyLeuArgProProPro                               152025                                                                         GGCTGTCCCCAGCGACGTCTGGGCGCGCGCGAGCGCCGGGACGTGCAG624                            GlyCysProGlnArgArgLeuGlyAlaArgGluArgArgAspValGln                               30354045                                                                       CGCGAGATCCTGGCGGTGCTCGGGCTGCCTGGGCGGCCCCGGCCCCGC672                            ArgGluIleLeuAlaValLeuGlyLeuProGlyArgProArgProArg                               505560                                                                         GCGCCACCCGCCGCCTCCCGGCTGCCCGCGTCCGCGCCGCTCTTCATG720                            AlaProProAlaAlaSerArgLeuProAlaSerAlaProLeuPheMet                               657075                                                                         CTGGACCTGTACCACGCCATGGCCGGCGACGACGACGAGGACGGCGCG768                            LeuAspLeuTyrHisAlaMetAlaGlyAspAspAspGluAspGlyAla                               808590                                                                         CCCGCGGAGCGGCGCCTGGGCCGCGCCGACCTGGTCATGAGCTTCGTT816                            ProAlaGluArgArgLeuGlyArgAlaAspLeuValMetSerPheVal                               95100105                                                                       AACATGGTGGAGCGAGACCGTGCCCTGGGCCACCAGGAGCCCCATTGG864                            AsnMetValGluArgAspArgAlaLeuGlyHisGlnGluProHisTrp                               110115120125                                                                   AAGGAGTTCCGCTTTGACCTGACCCAGATCCCGGCTGGGGAGGCGGTC912                            LysGluPheArgPheAspLeuThrGlnIleProAlaGlyGluAlaVal                               130135140                                                                      ACAGCTGCGGAGTTCCGGATTTACAAGGTGCCCAGCATCCACCTGCTC960                            ThrAlaAlaGluPheArgIleTyrLysValProSerIleHisLeuLeu                               145150155                                                                      AACAGGACCCTCCACGTCAGCATGTTCCAGGTGGTCCAGGAGCAGTCC1008                           AsnArgThrLeuHisValSerMetPheGlnValValGlnGluGlnSer                               160165170                                                                      AACAGGGAGTCTGACTTGTTCTTTTTGGATCTTCAGACGCTCCGAGCT1056                           AsnArgGluSerAspLeuPhePheLeuAspLeuGlnThrLeuArgAla                               175180185                                                                      GGAGACGAGGGCTGGCTGGTGCTGGATGTCACAGCAGCCAGTGACTGC1104                           GlyAspGluGlyTrpLeuValLeuAspValThrAlaAlaSerAspCys                               190195200205                                                                   TGGTTGCTGAAGCGTCACAAGGACCTGGGACTCCGCCTCTATGTGGAG1152                           TrpLeuLeuLysArgHisLysAspLeuGlyLeuArgLeuTyrValGlu                               210215220                                                                      ACTGAGGACGGGCACAGCGTGGATCCTGGCCTGGCCGGCCTGCTGGGT1200                           ThrGluAspGlyHisSerValAspProGlyLeuAlaGlyLeuLeuGly                               225230235                                                                      CAACGGGCCCCACGCTCCCAACAGCCTTTCGTGGTCACTTTCTTCAGG1248                           GlnArgAlaProArgSerGlnGlnProPheValValThrPhePheArg                               240245250                                                                      GCCAGTCCGAGTCCCATCCGCACCCCTCGGGCAGTGAGGCCACTGAGG1296                           AlaSerProSerProIleArgThrProArgAlaValArgProLeuArg                               255260265                                                                      AGGAGGCAGCCGAAGAAAAGCAACGAGCTGCCGCAGGCCAACCGACTC1344                           ArgArgGlnProLysLysSerAsnGluLeuProGlnAlaAsnArgLeu                               270275280285                                                                   CCAGGGATCTTTGATGACGTCCACGGCTCCCACGGCCGGCAGGTCTGC1392                           ProGlyIlePheAspAspValHisGlySerHisGlyArgGlnValCys                               290295300                                                                      CGTCGGCACGAGCTCTACGTCAGCTTCCAGGACCTCGGCTGGCTGGAC1440                           ArgArgHisGluLeuTyrValSerPheGlnAspLeuGlyTrpLeuAsp                               305310315                                                                      TGGGTCATCGCTCCCCAAGGCTACTCGGCCTATTACTGTGAGGGGGAG1488                           TrpValIleAlaProGlnGlyTyrSerAlaTyrTyrCysGluGlyGlu                               320325330                                                                      TGCTCCTTCCCACTGGACTCCTGCATGAATGCCACCAACCACGCCATC1536                           CysSerPheProLeuAspSerCysMetAsnAlaThrAsnHisAlaIle                               335340345                                                                      CTGCAGTCCCTGGTGCACCTGATGAAGCCAAACGCAGTCCCCAAGGCG1584                           LeuGlnSerLeuValHisLeuMetLysProAsnAlaValProLysAla                               350355360365                                                                   TGCTGTGCACCCACCAAGCTGAGCGCCACCTCTGTGCTCTACTATGAC1632                           CysCysAlaProThrLysLeuSerAlaThrSerValLeuTyrTyrAsp                               370375380                                                                      AGCAGCAACAACGTCATCCTGCGCAAACACCGCAACATGGTGGTCAAG1680                           SerSerAsnAsnValIleLeuArgLysHisArgAsnMetValValLys                               385390395                                                                      GCCTGCGGCTGCCACTGAGTCAGCCCGCCCAGCCCTACTGCAG1723                                AlaCysGlyCysHis                                                                400                                                                            (2) INFORMATION FOR SEQ ID NO:21:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 402 amino acids                                                    (B) TYPE: amino acid                                                           (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (xi) SEQUENCE DESCRIPTION: SEQ ID NO:21:                                       MetThrAlaLeuProGlyProLeuTrpLeuLeuGlyLeuAlaLeuCys                               151015                                                                         AlaLeuGlyGlyGlyGlyProGlyLeuArgProProProGlyCysPro                               202530                                                                         GlnArgArgLeuGlyAlaArgGluArgArgAspValGlnArgGluIle                               354045                                                                         LeuAlaValLeuGlyLeuProGlyArgProArgProArgAlaProPro                               505560                                                                         AlaAlaSerArgLeuProAlaSerAlaProLeuPheMetLeuAspLeu                               65707580                                                                       TyrHisAlaMetAlaGlyAspAspAspGluAspGlyAlaProAlaGlu                               859095                                                                         ArgArgLeuGlyArgAlaAspLeuValMetSerPheValAsnMetVal                               100105110                                                                      GluArgAspArgAlaLeuGlyHisGlnGluProHisTrpLysGluPhe                               115120125                                                                      ArgPheAspLeuThrGlnIleProAlaGlyGluAlaValThrAlaAla                               130135140                                                                      GluPheArgIleTyrLysValProSerIleHisLeuLeuAsnArgThr                               145150155160                                                                   LeuHisValSerMetPheGlnValValGlnGluGlnSerAsnArgGlu                               165170175                                                                      SerAspLeuPhePheLeuAspLeuGlnThrLeuArgAlaGlyAspGlu                               180185190                                                                      GlyTrpLeuValLeuAspValThrAlaAlaSerAspCysTrpLeuLeu                               195200205                                                                      LysArgHisLysAspLeuGlyLeuArgLeuTyrValGluThrGluAsp                               210215220                                                                      GlyHisSerValAspProGlyLeuAlaGlyLeuLeuGlyGlnArgAla                               225230235240                                                                   ProArgSerGlnGlnProPheValValThrPhePheArgAlaSerPro                               245250255                                                                      SerProIleArgThrProArgAlaValArgProLeuArgArgArgGln                               260265270                                                                      ProLysLysSerAsnGluLeuProGlnAlaAsnArgLeuProGlyIle                               275280285                                                                      PheAspAspValHisGlySerHisGlyArgGlnValCysArgArgHis                               290295300                                                                      GluLeuTyrValSerPheGlnAspLeuGlyTrpLeuAspTrpValIle                               305310315320                                                                   AlaProGlnGlyTyrSerAlaTyrTyrCysGluGlyGluCysSerPhe                               325330335                                                                      ProLeuAspSerCysMetAsnAlaThrAsnHisAlaIleLeuGlnSer                               340345350                                                                      LeuValHisLeuMetLysProAsnAlaValProLysAlaCysCysAla                               355360365                                                                      ProThrLysLeuSerAlaThrSerValLeuTyrTyrAspSerSerAsn                               370375380                                                                      AsnValIleLeuArgLysHisArgAsnMetValValLysAlaCysGly                               385390395400                                                                   CysHis                                                                         (2) INFORMATION FOR SEQ ID NO:22:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 1926 base pairs                                                    (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: cDNA                                                       (ix) FEATURE:                                                                  (A) NAME/KEY: CDS                                                              (B) LOCATION: 93..1289                                                         (D) OTHER INFORMATION: /product="MOP2 CDNA"                                    (xi) SEQUENCE DESCRIPTION: SEQ ID NO:22:                                       GCCAGGCACAGGTGCGCCGTCTGGTCCTCCCCGTCTGGCGTCAGCCGAGCCCGACCAGCT60                 ACCAGTGGATGCGCGCCGGCTGAAAGTCCGAGATGGCTATGCGTCCCGGGCCA113                       MetAlaMetArgProGlyPro                                                          15                                                                             CTCTGGCTATTGGGCCTTGCTCTGTGCGCGCTGGGAGGCGGCCACGGT161                            LeuTrpLeuLeuGlyLeuAlaLeuCysAlaLeuGlyGlyGlyHisGly                               101520                                                                         CCGCGTCCCCCGCACACCTGTCCCCAGCGTCGCCTGGGAGCGCGCGAG209                            ProArgProProHisThrCysProGlnArgArgLeuGlyAlaArgGlu                               253035                                                                         CGCCGCGACATGCAGCGTGAAATCCTGGCGGTGCTCGGGCTACCGGGA257                            ArgArgAspMetGlnArgGluIleLeuAlaValLeuGlyLeuProGly                               40455055                                                                       CGGCCCCGACCCCGTGCACAACCCGCGGCTGCCCGGCAGCCAGCGTCC305                            ArgProArgProArgAlaGlnProAlaAlaAlaArgGlnProAlaSer                               606570                                                                         GCGCCCCTCTTCATGTTGGACCTATACCACGCCATGACCGATGACGAC353                            AlaProLeuPheMetLeuAspLeuTyrHisAlaMetThrAspAspAsp                               758085                                                                         GACGGCGGGCCACCACAGGCTCACTTAGGCCGTGCCGACCTGGTCATG401                            AspGlyGlyProProGlnAlaHisLeuGlyArgAlaAspLeuValMet                               9095100                                                                        AGCTTCGTCAACATGGTGGAACGCGACCGTACCCTGGGCTACCAGGAG449                            SerPheValAsnMetValGluArgAspArgThrLeuGlyTyrGlnGlu                               105110115                                                                      CCACACTGGAAGGAATTCCACTTTGACCTAACCCAGATCCCTGCTGGG497                            ProHisTrpLysGluPheHisPheAspLeuThrGlnIleProAlaGly                               120125130135                                                                   GAGGCTGTCACAGCTGCTGAGTTCCGGATCTACAAAGAACCCAGCACC545                            GluAlaValThrAlaAlaGluPheArgIleTyrLysGluProSerThr                               140145150                                                                      CACCCGCTCAACACAACCCTCCACATCAGCATGTTCGAAGTGGTCCAA593                            HisProLeuAsnThrThrLeuHisIleSerMetPheGluValValGln                               155160165                                                                      GAGCACTCCAACAGGGAGTCTGACTTGTTCTTTTTGGATCTTCAGACG641                            GluHisSerAsnArgGluSerAspLeuPhePheLeuAspLeuGlnThr                               170175180                                                                      CTCCGATCTGGGGACGAGGGCTGGCTGGTGCTGGACATCACAGCAGCC689                            LeuArgSerGlyAspGluGlyTrpLeuValLeuAspIleThrAlaAla                               185190195                                                                      AGTGACCGATGGCTGCTGAACCATCACAAGGACCTGGGACTCCGCCTC737                            SerAspArgTrpLeuLeuAsnHisHisLysAspLeuGlyLeuArgLeu                               200205210215                                                                   TATGTGGAAACCGCGGATGGGCACAGCATGGATCCTGGCCTGGCTGGT785                            TyrValGluThrAlaAspGlyHisSerMetAspProGlyLeuAlaGly                               220225230                                                                      CTGCTTGGACGACAAGCACCACGCTCCAGACAGCCTTTCATGGTAACC833                            LeuLeuGlyArgGlnAlaProArgSerArgGlnProPheMetValThr                               235240245                                                                      TTCTTCAGGGCCAGCCAGAGTCCTGTGCGGGCCCCTCGGGCAGCGAGA881                            PhePheArgAlaSerGlnSerProValArgAlaProArgAlaAlaArg                               250255260                                                                      CCACTGAAGAGGAGGCAGCCAAAGAAAACGAACGAGCTTCCGCACCCC929                            ProLeuLysArgArgGlnProLysLysThrAsnGluLeuProHisPro                               265270275                                                                      AACAAACTCCCAGGGATCTTTGATGATGGCCACGGTTCCCGCGGCAGA977                            AsnLysLeuProGlyIlePheAspAspGlyHisGlySerArgGlyArg                               280285290295                                                                   GAGGTTTGCCGCAGGCATGAGCTCTACGTCAGCTTCCGTGACCTTGGC1025                           GluValCysArgArgHisGluLeuTyrValSerPheArgAspLeuGly                               300305310                                                                      TGGCTGGACTGGGTCATCGCCCCCCAGGGCTACTCTGCCTATTACTGT1073                           TrpLeuAspTrpValIleAlaProGlnGlyTyrSerAlaTyrTyrCys                               315320325                                                                      GAGGGGGAGTGTGCTTTCCCACTGGACTCCTGTATGAACGCCACCAAC1121                           GluGlyGluCysAlaPheProLeuAspSerCysMetAsnAlaThrAsn                               330335340                                                                      CATGCCATCTTGCAGTCTCTGGTGCACCTGATGAAGCCAGATGTTGTC1169                           HisAlaIleLeuGlnSerLeuValHisLeuMetLysProAspValVal                               345350355                                                                      CCCAAGGCATGCTGTGCACCCACCAAACTGAGTGCCACCTCTGTGCTG1217                           ProLysAlaCysCysAlaProThrLysLeuSerAlaThrSerValLeu                               360365370375                                                                   TACTATGACAGCAGCAACAATGTCATCCTGCGTAAACACCGTAACATG1265                           TyrTyrAspSerSerAsnAsnValIleLeuArgLysHisArgAsnMet                               380385390                                                                      GTGGTCAAGGCCTGTGGCTGCCACTGAGGCCCCGCCCAGCATCCTGCTTCTACT1319                     ValValLysAlaCysGlyCysHis                                                       395                                                                            ACCTTACCATCTGGCCGGGCCCCTCTCCAGAGGCAGAAACCCTTCTATGTTATCATAGCT1379               CAGACAGGGGCAATGGGAGGCCCTTCACTTCCCCTGGCCACTTCCTGCTAAAATTCTGGT1439               CTTTCCCAGTTCCTCTGTCCTTCATGGGGTTTCGGGGCTATCACCCCGCCCTCTCCATCC1499               TCCTACCCCAAGCATAGACTGAATGCACACAGCATCCCAGAGCTATGCTAACTGAGAGGT1559               CTGGGGTCAGCACTGAAGGCCCACATGAGGAAGACTGATCCTTGGCCATCCTCAGCCCAC1619               AATGGCAAATTCTGGATGGTCTAAGAAGGCCGTGGAATTCTAAACTAGATGATCTGGGCT1679               CTCTGCACCATTCATTGTGGCAGTTGGGACATTTTTAGGTATAACAGACACATACACTTA1739               GATCAATGCATCGCTGTACTCCTTGAAATCAGAGCTAGCTTGTTAGAAAAAGAATCAGAG1799               CCAGGTATAGCGGTGCATGTCATTAATCCCAGCGCTAAAGAGACAGAGACAGGAGAATCT1859               CTGTGAGTTCAAGGCCACATAGAAAGAGCCTGTCTCGGGAGCAGGAAAAAAAAAAAAAAC1919               GGAATTC1926                                                                    (2) INFORMATION FOR SEQ ID NO:23:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 399 amino acids                                                    (B) TYPE: amino acid                                                           (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (xi) SEQUENCE DESCRIPTION: SEQ ID NO:23:                                       MetAlaMetArgProGlyProLeuTrpLeuLeuGlyLeuAlaLeuCys                               151015                                                                         AlaLeuGlyGlyGlyHisGlyProArgProProHisThrCysProGln                               202530                                                                         ArgArgLeuGlyAlaArgGluArgArgAspMetGlnArgGluIleLeu                               354045                                                                         AlaValLeuGlyLeuProGlyArgProArgProArgAlaGlnProAla                               505560                                                                         AlaAlaArgGlnProAlaSerAlaProLeuPheMetLeuAspLeuTyr                               65707580                                                                       HisAlaMetThrAspAspAspAspGlyGlyProProGlnAlaHisLeu                               859095                                                                         GlyArgAlaAspLeuValMetSerPheValAsnMetValGluArgAsp                               100105110                                                                      ArgThrLeuGlyTyrGlnGluProHisTrpLysGluPheHisPheAsp                               115120125                                                                      LeuThrGlnIleProAlaGlyGluAlaValThrAlaAlaGluPheArg                               130135140                                                                      IleTyrLysGluProSerThrHisProLeuAsnThrThrLeuHisIle                               145150155160                                                                   SerMetPheGluValValGlnGluHisSerAsnArgGluSerAspLeu                               165170175                                                                      PhePheLeuAspLeuGlnThrLeuArgSerGlyAspGluGlyTrpLeu                               180185190                                                                      ValLeuAspIleThrAlaAlaSerAspArgTrpLeuLeuAsnHisHis                               195200205                                                                      LysAspLeuGlyLeuArgLeuTyrValGluThrAlaAspGlyHisSer                               210215220                                                                      MetAspProGlyLeuAlaGlyLeuLeuGlyArgGlnAlaProArgSer                               225230235240                                                                   ArgGlnProPheMetValThrPhePheArgAlaSerGlnSerProVal                               245250255                                                                      ArgAlaProArgAlaAlaArgProLeuLysArgArgGlnProLysLys                               260265270                                                                      ThrAsnGluLeuProHisProAsnLysLeuProGlyIlePheAspAsp                               275280285                                                                      GlyHisGlySerArgGlyArgGluValCysArgArgHisGluLeuTyr                               290295300                                                                      ValSerPheArgAspLeuGlyTrpLeuAspTrpValIleAlaProGln                               305310315320                                                                   GlyTyrSerAlaTyrTyrCysGluGlyGluCysAlaPheProLeuAsp                               325330335                                                                      SerCysMetAsnAlaThrAsnHisAlaIleLeuGlnSerLeuValHis                               340345350                                                                      LeuMetLysProAspValValProLysAlaCysCysAlaProThrLys                               355360365                                                                      LeuSerAlaThrSerValLeuTyrTyrAspSerSerAsnAsnValIle                               370375380                                                                      LeuArgLysHisArgAsnMetValValLysAlaCysGlyCysHis                                  385390395                                                                      (2) INFORMATION FOR SEQ ID NO:24:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 1368 base pairs                                                    (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: cDNA                                                       (ix) FEATURE:                                                                  (A) NAME/KEY: CDS                                                              (B) LOCATION: 1..1365                                                          (xi) SEQUENCE DESCRIPTION: SEQ ID NO:24:                                       ATGTCGGGACTGCGAAACACCTCGGAGGCCGTTGCAGTGCTCGCCTCC48                             MetSerGlyLeuArgAsnThrSerGluAlaValAlaValLeuAlaSer                               151015                                                                         CTGGGACTCGGAATGGTTCTGCTCATGTTCGTGGCGACCACGCCGCCG96                             LeuGlyLeuGlyMetValLeuLeuMetPheValAlaThrThrProPro                               202530                                                                         GCCGTTGAGGCCACCCAGTCGGGGATTTACATAGACAACGGCAAGGAC144                            AlaValGluAlaThrGlnSerGlyIleTyrIleAspAsnGlyLysAsp                               354045                                                                         CAGACGATCATGCACAGAGTGCTGAGCGAGGACGACAAGCTGGACGTC192                            GlnThrIleMetHisArgValLeuSerGluAspAspLysLeuAspVal                               505560                                                                         TCGTACGAGATCCTCGAGTTCCTGGGCATCGCCGAACGGCCGACGCAC240                            SerTyrGluIleLeuGluPheLeuGlyIleAlaGluArgProThrHis                               65707580                                                                       CTGAGCAGCCACCAGTTGTCGCTGAGGAAGTCGGCTCCCAAGTTCCTG288                            LeuSerSerHisGlnLeuSerLeuArgLysSerAlaProLysPheLeu                               859095                                                                         CTGGACGTCTACCACCGCATCACGGCGGAGGAGGGTCTCAGCGATCAG336                            LeuAspValTyrHisArgIleThrAlaGluGluGlyLeuSerAspGln                               100105110                                                                      GATGAGGACGACGACTACGAACGCGGCCATCGGTCCAGGAGGAGCGCC384                            AspGluAspAspAspTyrGluArgGlyHisArgSerArgArgSerAla                               115120125                                                                      GACCTCGAGGAGGATGAGGGCGAGCAGCAGAAGAACTTCATCACCGAC432                            AspLeuGluGluAspGluGlyGluGlnGlnLysAsnPheIleThrAsp                               130135140                                                                      CTGGACAAGCGGGCCATCGACGAGAGCGACATCATCATGACCTTCCTG480                            LeuAspLysArgAlaIleAspGluSerAspIleIleMetThrPheLeu                               145150155160                                                                   AACAAGCGCCACCACAATGTGGACGAACTGCGTCACGAGCACGGCCGT528                            AsnLysArgHisHisAsnValAspGluLeuArgHisGluHisGlyArg                               165170175                                                                      CGCCTGTGGTTCGACGTCTCCAACGTGCCCAACGACAACTACCTGGTG576                            ArgLeuTrpPheAspValSerAsnValProAsnAspAsnTyrLeuVal                               180185190                                                                      ATGGCCGAGCTGCGCATCTATCAGAACGCCAACGAGGGCAAGTGGCTG624                            MetAlaGluLeuArgIleTyrGlnAsnAlaAsnGluGlyLysTrpLeu                               195200205                                                                      ACCGCCAACAGGGAGTTCACCATCACGGTATACGCCATTGGCACCGGC672                            ThrAlaAsnArgGluPheThrIleThrValTyrAlaIleGlyThrGly                               210215220                                                                      ACGCTGGGCCAGCACACCATGGAGCCGCTGTCCTCGGTGAACACCACC720                            ThrLeuGlyGlnHisThrMetGluProLeuSerSerValAsnThrThr                               225230235240                                                                   GGGGACTACGTGGGCTGGTTGGAGCTCAACGTGACCGAGGGCCTGCAC768                            GlyAspTyrValGlyTrpLeuGluLeuAsnValThrGluGlyLeuHis                               245250255                                                                      GAGTGGCTGGTCAAGTCGAAGGACAATCATGGCATCTACATTGGAGCA816                            GluTrpLeuValLysSerLysAspAsnHisGlyIleTyrIleGlyAla                               260265270                                                                      CACGCTGTCAACCGACCCGACCGCGAGGTGAAGCTGGACGACATTGGA864                            HisAlaValAsnArgProAspArgGluValLysLeuAspAspIleGly                               275280285                                                                      CTGATCCACCGCAAGGTGGACGACGAGTTCCAGCCCTTCATGATCGGC912                            LeuIleHisArgLysValAspAspGluPheGlnProPheMetIleGly                               290295300                                                                      TTCTTCCGCGGACCGGAGCTGATCAAGGCGACGGCCCACAGCAGCCAC960                            PhePheArgGlyProGluLeuIleLysAlaThrAlaHisSerSerHis                               305310315320                                                                   CACAGGAGCAAGCGAAGCGCCAGCCATCCACGCAAGCGCAAGAAGTCG1008                           HisArgSerLysArgSerAlaSerHisProArgLysArgLysLysSer                               325330335                                                                      GTGTCGCCCAACAACGTGCCGCTGCTGGAACCGATGGAGAGCACGCGC1056                           ValSerProAsnAsnValProLeuLeuGluProMetGluSerThrArg                               340345350                                                                      AGCTGCCAGATGCAGACCCTGTACATAGACTTCAAGGATCTGGGCTGG1104                           SerCysGlnMetGlnThrLeuTyrIleAspPheLysAspLeuGlyTrp                               355360365                                                                      CATGACTGGATCATCGCACCAGAGGGCTATGGCGCCTTCTACTGCAGC1152                           HisAspTrpIleIleAlaProGluGlyTyrGlyAlaPheTyrCysSer                               370375380                                                                      GGCGAGTGCAATTTCCCGCTCAATGCGCACATGAACGCCACGAACCAT1200                           GlyGluCysAsnPheProLeuAsnAlaHisMetAsnAlaThrAsnHis                               385390395400                                                                   GCGATCGTCCAGACCCTGGTCCACCTGCTGGAGCCCAAGAAGGTGCCC1248                           AlaIleValGlnThrLeuValHisLeuLeuGluProLysLysValPro                               405410415                                                                      AAGCCCTGCTGCGCTCCGACCAGGCTGGGAGCACTACCCGTTCTGTAC1296                           LysProCysCysAlaProThrArgLeuGlyAlaLeuProValLeuTyr                               420425430                                                                      CACCTGAACGACGAGAATGTGAACCTGAAAAAGTATAGAAACATGATT1344                           HisLeuAsnAspGluAsnValAsnLeuLysLysTyrArgAsnMetIle                               435440445                                                                      GTGAAATCCTGCGGGTGCCATTGA1368                                                   ValLysSerCysGlyCysHis                                                          450455                                                                         (2) INFORMATION FOR SEQ ID NO:25:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 455 amino acids                                                    (B) TYPE: amino acid                                                           (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (xi) SEQUENCE DESCRIPTION: SEQ ID NO:25:                                       MetSerGlyLeuArgAsnThrSerGluAlaValAlaValLeuAlaSer                               151015                                                                         LeuGlyLeuGlyMetValLeuLeuMetPheValAlaThrThrProPro                               202530                                                                         AlaValGluAlaThrGlnSerGlyIleTyrIleAspAsnGlyLysAsp                               354045                                                                         GlnThrIleMetHisArgValLeuSerGluAspAspLysLeuAspVal                               505560                                                                         SerTyrGluIleLeuGluPheLeuGlyIleAlaGluArgProThrHis                               65707580                                                                       LeuSerSerHisGlnLeuSerLeuArgLysSerAlaProLysPheLeu                               859095                                                                         LeuAspValTyrHisArgIleThrAlaGluGluGlyLeuSerAspGln                               100105110                                                                      AspGluAspAspAspTyrGluArgGlyHisArgSerArgArgSerAla                               115120125                                                                      AspLeuGluGluAspGluGlyGluGlnGlnLysAsnPheIleThrAsp                               130135140                                                                      LeuAspLysArgAlaIleAspGluSerAspIleIleMetThrPheLeu                               145150155160                                                                   AsnLysArgHisHisAsnValAspGluLeuArgHisGluHisGlyArg                               165170175                                                                      ArgLeuTrpPheAspValSerAsnValProAsnAspAsnTyrLeuVal                               180185190                                                                      MetAlaGluLeuArgIleTyrGlnAsnAlaAsnGluGlyLysTrpLeu                               195200205                                                                      ThrAlaAsnArgGluPheThrIleThrValTyrAlaIleGlyThrGly                               210215220                                                                      ThrLeuGlyGlnHisThrMetGluProLeuSerSerValAsnThrThr                               225230235240                                                                   GlyAspTyrValGlyTrpLeuGluLeuAsnValThrGluGlyLeuHis                               245250255                                                                      GluTrpLeuValLysSerLysAspAsnHisGlyIleTyrIleGlyAla                               260265270                                                                      HisAlaValAsnArgProAspArgGluValLysLeuAspAspIleGly                               275280285                                                                      LeuIleHisArgLysValAspAspGluPheGlnProPheMetIleGly                               290295300                                                                      PhePheArgGlyProGluLeuIleLysAlaThrAlaHisSerSerHis                               305310315320                                                                   HisArgSerLysArgSerAlaSerHisProArgLysArgLysLysSer                               325330335                                                                      ValSerProAsnAsnValProLeuLeuGluProMetGluSerThrArg                               340345350                                                                      SerCysGlnMetGlnThrLeuTyrIleAspPheLysAspLeuGlyTrp                               355360365                                                                      HisAspTrpIleIleAlaProGluGlyTyrGlyAlaPheTyrCysSer                               370375380                                                                      GlyGluCysAsnPheProLeuAsnAlaHisMetAsnAlaThrAsnHis                               385390395400                                                                   AlaIleValGlnThrLeuValHisLeuLeuGluProLysLysValPro                               405410415                                                                      LysProCysCysAlaProThrArgLeuGlyAlaLeuProValLeuTyr                               420425430                                                                      HisLeuAsnAspGluAsnValAsnLeuLysLysTyrArgAsnMetIle                               435440445                                                                      ValLysSerCysGlyCysHis                                                          450455                                                                         (2) INFORMATION FOR SEQ ID NO:26:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 104 amino acids                                                    (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..104                                                           (D) OTHER INFORMATION: /label=BMP3                                             (xi) SEQUENCE DESCRIPTION: SEQ ID NO:26:                                       CysAlaArgArgTyrLeuLysValAspPheAlaAspIleGlyTrpSer                               151015                                                                         GluTrpIleIleSerProLysSerPheAspAlaTyrTyrCysSerGly                               202530                                                                         AlaCysGlnPheProMetProLysSerLeuLysProSerAsnHisAla                               354045                                                                         ThrIleGlnSerIleValAlaArgAlaValGlyValValProGlyIle                               505560                                                                         ProGluProCysCysValProGluLysMetSerSerLeuSerIleLeu                               65707580                                                                       PhePheAspGluAsnLysAsnValValLeuLysValTyrProAsnMet                               859095                                                                         ThrValGluSerCysAlaCysArg                                                       100                                                                            (2) INFORMATION FOR SEQ ID NO:27:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 102 amino acids                                                    (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..102                                                           (D) OTHER INFORMATION: /label=BMP5                                             (xi) SEQUENCE DESCRIPTION: SEQ ID NO:27:                                       CysLysLysHisGluLeuTyrValSerPheArgAspLeuGlyTrpGln                               151015                                                                         AspTrpIleIleAlaProGluGlyTyrAlaAlaPheTyrCysAspGly                               202530                                                                         GluCysSerPheProLeuAsnAlaHisMetAsnAlaThrAsnHisAla                               354045                                                                         IleValGlnThrLeuValHisLeuMetPheProAspHisValProLys                               505560                                                                         ProCysCysAlaProThrLysLeuAsnAlaIleSerValLeuTyrPhe                               65707580                                                                       AspAspSerSerAsnValIleLeuLysLysTyrArgAsnMetValVal                               859095                                                                         ArgSerCysGlyCysHis                                                             100                                                                            (2) INFORMATION FOR SEQ ID NO:28:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 102 amino acids                                                    (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..102                                                           (D) OTHER INFORMATION: /label=BMP6                                             (xi) SEQUENCE DESCRIPTION: SEQ ID NO:28:                                       CysArgLysHisGluLeuTyrValSerPheGlnAspLeuGlyTrpGln                               151015                                                                         AspTrpIleIleAlaProLysGlyTyrAlaAlaAsnTyrCysAspGly                               202530                                                                         GluCysSerPheProLeuAsnAlaHisMetAsnAlaThrAsnHisAla                               354045                                                                         IleValGlnThrLeuValHisLeuMetAsnProGluTyrValProLys                               505560                                                                         ProCysCysAlaProThrLysLeuAsnAlaIleSerValLeuTyrPhe                               65707580                                                                       AspAspAsnSerAsnValIleLeuLysLysTyrArgTrpMetValVal                               859095                                                                         ArgAlaCysGlyCysHis                                                             100                                                                            (2) INFORMATION FOR SEQ ID NO:29:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 102 amino acids                                                    (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..102                                                           (D) OTHER INFORMATION: /label=OPX                                              /note= "WHEREIN XAA AT EACH POS'N IS INDEPENDENTLY                             SELECTED FROM THE RESIDUES OCCURING AT THE CORRESPONDING                       POS'N IN THE C-TERMINAL SEQUENCE OF MOUSE OR HUMAN OP1                         OR OP2 (SEQ. ID NOS. 5,6,7&8 OR 16,18, 20&22"                                  (xi) SEQUENCE DESCRIPTION: SEQ ID NO:29:                                       CysXaaXaaHisGluLeuTyrValXaaPheXaaAspLeuGlyTrpXaa                               151015                                                                         AspTrpXaaIleAlaProXaaGlyTyrXaaAlaTyrTyrCysGluGly                               202530                                                                         GluCysXaaPheProLeuXaaSerXaaMetAsnAlaThrAsnHisAla                               354045                                                                         IleXaaGlnXaaLeuValHisXaaXaaXaaProXaaXaaValProLys                               505560                                                                         XaaCysCysAlaProThrXaaLeuXaaAlaXaaSerValLeuTyrXaa                               65707580                                                                       AspXaaSerXaaAsnValXaaLeuXaaLysXaaArgAsnMetValVal                               859095                                                                         XaaAlaCysGlyCysHis                                                             100                                                                            (2) INFORMATION FOR SEQ ID NO:30:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 97 amino acids                                                     (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..97                                                            (D) OTHER INFORMATION: /label=GENERIC-SEQ-5                                    /note= "WHEREIN EACH XAA IS INDEPENDENTLY SELECTED FROM A                      GROUP OF ONE OR MORE SPECIFIED AMINO ACIDS AS DEFINED IN                       THE SPECIFICATION"                                                             (xi) SEQUENCE DESCRIPTION: SEQ ID NO:30:                                       LeuXaaXaaXaaPheXaaXaaXaaGlyTrpXaaXaaTrpXaaXaaXaa                               151015                                                                         ProXaaXaaXaaXaaAlaXaaTyrCysXaaGlyXaaCysXaaXaaPro                               202530                                                                         XaaXaaXaaXaaXaaXaaXaaXaaAsnHisAlaXaaXaaXaaXaaXaa                               354045                                                                         XaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaCysCysXaaPro                               505560                                                                         XaaXaaXaaXaaXaaXaaXaaXaaLeuXaaXaaXaaXaaXaaXaaXaa                               65707580                                                                       ValXaaLeuXaaXaaXaaXaaXaaMetXaaValXaaXaaCysXaaCys                               859095                                                                         Xaa                                                                            (2) INFORMATION FOR SEQ ID NO:31:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 102 amino acids                                                    (B) TYPE: amino acid                                                           (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (ix) FEATURE:                                                                  (A) NAME/KEY: Protein                                                          (B) LOCATION: 1..102                                                           (D) OTHER INFORMATION: /label=GENERIC-SEQ-6                                    /note= "WHEREIN EACH XAA IS INDEPENDENTLY SELECTED FROM                        A GROUP OF ONE OR MORE SPECIFIED AMINO ACIDS AS                                DEFINED IN THE SPECIFICATION"                                                  (xi) SEQUENCE DESCRIPTION: SEQ ID NO:31:                                       CysXaaXaaXaaXaaLeuXaaXaaXaaPheXaaXaaXaaGlyTrpXaa                               151015                                                                         XaaTrpXaaXaaXaaProXaaXaaXaaXaaAlaXaaTyrCysXaaGly                               202530                                                                         XaaCysXaaXaaProXaaXaaXaaXaaXaaXaaXaaXaaAsnHisAla                               354045                                                                         XaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaaXaa                               505560                                                                         XaaCysCysXaaProXaaXaaXaaXaaXaaXaaXaaXaaLeuXaaXaa                               65707580                                                                       XaaXaaXaaXaaXaaValXaaLeuXaaXaaXaaXaaXaaMetXaaVal                               859095                                                                         XaaXaaCysXaaCysXaa                                                             100                                                                            (2) INFORMATION FOR SEQ ID NO:32:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 1247 base pairs                                                    (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: cDNA                                                       (ix) FEATURE:                                                                  (A) NAME/KEY: CDS                                                              (B) LOCATION: 84..1199                                                         (D) OTHER INFORMATION: /product="GDF-1"                                        (xi) SEQUENCE DESCRIPTION: SEQ ID NO:32:                                       GGGGACACCGGCCCCGCCCTCAGCCCACTGGTCCCGGGCCGCCGCGGACCCTGCGCACTC60                 TCTGGTCATCGCCTGGGAGGAAGATGCCACCGCCGCAGCAAGGTCCCTGC110                          MetProProProGlnGlnGlyProCys                                                    15                                                                             GGCCACCACCTCCTCCTCCTCCTGGCCCTGCTGCTGCCCTCGCTGCCC158                            GlyHisHisLeuLeuLeuLeuLeuAlaLeuLeuLeuProSerLeuPro                               10152025                                                                       CTGACCCGCGCCCCCGTGCCCCCAGGCCCAGCCGCCGCCCTGCTCCAG206                            LeuThrArgAlaProValProProGlyProAlaAlaAlaLeuLeuGln                               303540                                                                         GCTCTAGGACTGCGCGATGAGCCCCAGGGTGCCCCCAGGCTCCGGCCG254                            AlaLeuGlyLeuArgAspGluProGlnGlyAlaProArgLeuArgPro                               455055                                                                         GTTCCCCCGGTCATGTGGCGCCTGTTTCGACGCCGGGACCCCCAGGAG302                            ValProProValMetTrpArgLeuPheArgArgArgAspProGlnGlu                               606570                                                                         ACCAGGTCTGGCTCGCGGCGGACGTCCCCAGGGGTCACCCTGCAACCG350                            ThrArgSerGlySerArgArgThrSerProGlyValThrLeuGlnPro                               758085                                                                         TGCCACGTGGAGGAGCTGGGGGTCGCCGGAAACATCGTGCGCCACATC398                            CysHisValGluGluLeuGlyValAlaGlyAsnIleValArgHisIle                               9095100105                                                                     CCGGACCGCGGTGCGCCCACCCGGGCCTCGGAGCCTGTCTCGGCCGCG446                            ProAspArgGlyAlaProThrArgAlaSerGluProValSerAlaAla                               110115120                                                                      GGGCATTGCCCTGAGTGGACAGTCGTCTTCGACCTGTCGGCTGTGGAA494                            GlyHisCysProGluTrpThrValValPheAspLeuSerAlaValGlu                               125130135                                                                      CCCGCTGAGCGCCCGAGCCGGGCCCGCCTGGAGCTGCGTTTCGCGGCG542                            ProAlaGluArgProSerArgAlaArgLeuGluLeuArgPheAlaAla                               140145150                                                                      GCGGCGGCGGCAGCCCCGGAGGGCGGCTGGGAGCTGAGCGTGGCGCAA590                            AlaAlaAlaAlaAlaProGluGlyGlyTrpGluLeuSerValAlaGln                               155160165                                                                      GCGGGCCAGGGCGCGGGCGCGGACCCCGGGCCGGTGCTGCTCCGCCAG638                            AlaGlyGlnGlyAlaGlyAlaAspProGlyProValLeuLeuArgGln                               170175180185                                                                   TTGGTGCCCGCCCTGGGGCCGCCAGTGCGCGCGGAGCTGCTGGGCGCC686                            LeuValProAlaLeuGlyProProValArgAlaGluLeuLeuGlyAla                               190195200                                                                      GCTTGGGCTCGCAACGCCTCATGGCCGCGCAGCCTCCGCCTGGCGCTG734                            AlaTrpAlaArgAsnAlaSerTrpProArgSerLeuArgLeuAlaLeu                               205210215                                                                      GCGCTACGCCCCCGGGCCCCTGCCGCCTGCGCGCGCCTGGCCGAGGCC782                            AlaLeuArgProArgAlaProAlaAlaCysAlaArgLeuAlaGluAla                               220225230                                                                      TCGCTGCTGCTGGTGACCCTCGACCCGCGCCTGTGCCACCCCCTGGCC830                            SerLeuLeuLeuValThrLeuAspProArgLeuCysHisProLeuAla                               235240245                                                                      CGGCCGCGGCGCGACGCCGAACCCGTGTTGGGCGGCGGCCCCGGGGGC878                            ArgProArgArgAspAlaGluProValLeuGlyGlyGlyProGlyGly                               250255260265                                                                   GCTTGTCGCGCGCGGCGGCTGTACGTGAGCTTCCGCGAGGTGGGCTGG926                            AlaCysArgAlaArgArgLeuTyrValSerPheArgGluValGlyTrp                               270275280                                                                      CACCGCTGGGTCATCGCGCCGCGCGGCTTCCTGGCCAACTACTGCCAG974                            HisArgTrpValIleAlaProArgGlyPheLeuAlaAsnTyrCysGln                               285290295                                                                      GGTCAGTGCGCGCTGCCCGTCGCGCTGTCGGGGTCCGGGGGGCCGCCG1022                           GlyGlnCysAlaLeuProValAlaLeuSerGlySerGlyGlyProPro                               300305310                                                                      GCGCTCAACCACGCTGTGCTGCGCGCGCTCATGCACGCGGCCGCCCCG1070                           AlaLeuAsnHisAlaValLeuArgAlaLeuMetHisAlaAlaAlaPro                               315320325                                                                      GGAGCCGCCGACCTGCCCTGCTGCGTGCCCGCGCGCCTGTCGCCCATC1118                           GlyAlaAlaAspLeuProCysCysValProAlaArgLeuSerProIle                               330335340345                                                                   TCCGTGCTCTTCTTTGACAACAGCGACAACGTGGTGCTGCGGCAGTAT1166                           SerValLeuPhePheAspAsnSerAspAsnValValLeuArgGlnTyr                               350355360                                                                      GAGGACATGGTGGTGGACGAGTGCGGCTGCCGCTAACCCGGGGCGGGCAGGGA1219                      GluAspMetValValAspGluCysGlyCysArg                                              365370                                                                         CCCGGGCCCAACAATAAATGCCGCGTGG1247                                               (2) INFORMATION FOR SEQ ID NO:33:                                              (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 372 amino acids                                                    (B) TYPE: amino acid                                                           (D) TOPOLOGY: linear                                                           (ii) MOLECULE TYPE: protein                                                    (xi) SEQUENCE DESCRIPTION: SEQ ID NO:33:                                       MetProProProGlnGlnGlyProCysGlyHisHisLeuLeuLeuLeu                               151015                                                                         LeuAlaLeuLeuLeuProSerLeuProLeuThrArgAlaProValPro                               202530                                                                         ProGlyProAlaAlaAlaLeuLeuGlnAlaLeuGlyLeuArgAspGlu                               354045                                                                         ProGlnGlyAlaProArgLeuArgProValProProValMetTrpArg                               505560                                                                         LeuPheArgArgArgAspProGlnGluThrArgSerGlySerArgArg                               65707580                                                                       ThrSerProGlyValThrLeuGlnProCysHisValGluGluLeuGly                               859095                                                                         ValAlaGlyAsnIleValArgHisIleProAspArgGlyAlaProThr                               100105110                                                                      ArgAlaSerGluProValSerAlaAlaGlyHisCysProGluTrpThr                               115120125                                                                      ValValPheAspLeuSerAlaValGluProAlaGluArgProSerArg                               130135140                                                                      AlaArgLeuGluLeuArgPheAlaAlaAlaAlaAlaAlaAlaProGlu                               145150155160                                                                   GlyGlyTrpGluLeuSerValAlaGlnAlaGlyGlnGlyAlaGlyAla                               165170175                                                                      AspProGlyProValLeuLeuArgGlnLeuValProAlaLeuGlyPro                               180185190                                                                      ProValArgAlaGluLeuLeuGlyAlaAlaTrpAlaArgAsnAlaSer                               195200205                                                                      TrpProArgSerLeuArgLeuAlaLeuAlaLeuArgProArgAlaPro                               210215220                                                                      AlaAlaCysAlaArgLeuAlaGluAlaSerLeuLeuLeuValThrLeu                               225230235240                                                                   AspProArgLeuCysHisProLeuAlaArgProArgArgAspAlaGlu                               245250255                                                                      ProValLeuGlyGlyGlyProGlyGlyAlaCysArgAlaArgArgLeu                               260265270                                                                      TyrValSerPheArgGluValGlyTrpHisArgTrpValIleAlaPro                               275280285                                                                      ArgGlyPheLeuAlaAsnTyrCysGlnGlyGlnCysAlaLeuProVal                               290295300                                                                      AlaLeuSerGlySerGlyGlyProProAlaLeuAsnHisAlaValLeu                               305310315320                                                                   ArgAlaLeuMetHisAlaAlaAlaProGlyAlaAlaAspLeuProCys                               325330335                                                                      CysValProAlaArgLeuSerProIleSerValLeuPhePheAspAsn                               340345350                                                                      SerAspAsnValValLeuArgGlnTyrGluAspMetValValAspGlu                               355360365                                                                      CysGlyCysArg                                                                   370                                                                            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What is claimed is:
 1. A method for enhancing integration of a tooth in a mammalian tooth socket, comprising the step of administering a morphogen to a surface of said tooth socket or to an exterior root surface of said tooth, in an amount effective for inducing proliferation or differentiation of cementoblasts or periodontal fibroblasts, said morphogen comprising a dimeric protein that, when disposed in a mammalian tooth socket, induces periodontal tissue morphogenesis therein, said dimeric protein comprising a pair of folded polypeptides, the amino acid sequence of each of which comprises(i) a sequence sharing at least 70% homology with the C-terminal seven cysteine domain of human OP-1, residues 38-139 of Seq. ID No. 5; or (ii) a sequence defined by Generic Sequence 6, Seq. ID No.
 31. 2. The method of claim 1 wherein said tooth socket comprises lost, damaged or nonviable periodontal tissue.
 3. The method of claim 2 wherein said morphogen is administered to said surface prior to implantation of said tooth in said tooth socket.
 4. The method of claim 3 comprising the additional preparative step of surgically removing scar tissue from an alveolar bone surface of said tooth socket prior to implantation of said tooth in said tooth socket.
 5. The method of claim 3 comprising the additional preparative step of treating said surface with a demineralizing solution.
 6. The method of claim 1 wherein said tooth is an implanted tooth.
 7. The method of claim 1 wherein said tooth is a prosthetic tooth.
 8. The method of claim 7 wherein said prosthetic tooth is an allogenic or autologous tooth.
 9. A method for regenerating periodontal tissue in a mammalian tooth socket, or for inhibiting loss thereof, comprising the step of administering a morphogen to said tooth socket, in an amount effective for stimulating regeneration of periodontal ligament or cementum, or for preserving the differentiated phenotype of existing periodontal tissue, said morphogen comprising a dimeric protein that, when disposed in a mammalian tooth socket, induces periodontal tissue morphogenesis therein, said dimeric protein comprising a pair of folded polypeptides, the amino acid sequence of each of which comprises(i) a sequence sharing at least 70% homology with the C-terminal seven cysteine domain of human OP-1, residues 38-139 of Seq. ID No. 5; or (ii) a sequence defined by Generic Sequence 6, Seq. ID No.
 31. 10. A method for inhibiting tissue damage associated with periodontal disease in a mammal, comprising the step of administering a morphogen to mammalian periodontal tissue at risk of said tissue damage, in an amount effective for inhibiting intimation or scarring, or for preserving the differentiated periodontal phenotype thereof, said morphogen comprising a dimeric protein that, when disposed in a mammalian tooth socket, induces periodontal tissue morphogenesis therein, said dimeric protein comprising a pair of folded polypeptides, the amino acid sequence of each of which comprises(i) a sequence sharing at least 70% homology with the C-terminal seven cysteine domain of human OP-1, residues 38-139 of Seq. ID No. 5; or (ii) a sequence defined by Generic Sequence 6, Seq. ID No.
 31. 11. The method of claim 10 wherein said morphogen is administered systemically to said mammal.
 12. A method for preparing a tooth or a mammalian tooth socket for implantation of said tooth into said socket, said socket being significantly reduced in viable periodontal tissue, the method comprising the steps of:(a) preparing said tooth socket to receive said tooth by exposing a surface of fresh alveolar bone therein; and (b) administering a morphogen to either the exterior root surface of said tooth or to the exposed surface of fresh alveolar bone in said prepared socket, said morphogen being administered to said surface in an amount effective for inducing proliferation or differentiation of cementoblasts or periodontal fibroblasts, said morphogen comprising a dimeric protein that, when disposed in a mammalian tooth socket, induces periodontal tissue morphogenesis therein, said dimeric protein comprising a pair of folded polypeptides, the amino acid sequence of each of which comprises(i) a sequence sharing at least 70% homology with the C-terminal seven cysteine domain of human OP-1, residues 38-139 of Seq. ID No. 5; or (ii) a sequence defined by Generic Sequence 6, Seq. ID No.
 31. 13. A method for implanting a tooth in a mammalian tooth socket, said socket being significantly reduced in viable periodontal tissue, comprising the steps of:(a) preparing said socket to receive a tooth by exposing a fresh surface of alveolar bone therein; (b) administering a morphogen either to the exterior root surface of said tooth or to the exposed fresh surface of alveolar bone in said tooth socket, in an amount effective for inducing proliferation or differentiation of cementoblasts or periodontal fibroblasts, said morphogen comprising a dimeric protein that, when disposed in a mammalian tooth socket, induces periodontal tissue morphogenesis therein, said dimeric protein comprising a pair of folded polypeptides, the amino acid sequence of each of which comprises(i) a sequence sharing at least 70% homology with the C-terminal seven cysteine domain of human OP-1, residues 38-139 of Seq. ID No. 5; or (ii) a sequence defined by Generic Sequence 6, Seq. ID No. 31; and (c) implanting said tooth in said prepared socket.
 14. The method of claim 12 or 13 wherein said tooth root surface is partially demineralized before contact with said morphogen.
 15. The method of claim 1, 9, 10, 12, or 13 wherein said morphogen is administered topically or by local injection.
 16. The method of claim 15 wherein said morphogen is administered topically in a biocompatible acellular matrix.
 17. The method of claim 16 wherein said matrix is derived from periodontal ligament, bone or cementum tissue.
 18. The method of claim 16 wherein the amount of said morphogen administered is less than about 50 μg.
 19. The method of claim 18 wherein the amount of said morphogen administered is less than about 25 μg.
 20. The method of claim 15 wherein morphogen is administered topically in a viscous solution that maintains said morphogen at the locus of administration.
 21. The method of claim 1, 9, 10, 12, or 13 wherein the amino acid sequence of each of said polypeptides comprises an approximately 102 amino acid sequence having cysteine residues at relative positions 1, 30, 34, 66, 67, 99 and 101 therein, wherein at least 70% of amino acid residues within said sequence are selected independently from residues occupying the corresponding positions within the sequence spanning residues 38-139 of Seq. ID No. 5, and conservative substitutions of said residues.
 22. The method of claim 21 wherein said approximately 102 amino acid sequence has at least 101 amino acids.
 23. The method of claim 21 wherein said approximately 102 amino acid sequence has at most 106 amino acids.
 24. The method of claim 1, 9, 10, 12 or 13 wherein the amino acid sequence of each of said polypeptides comprises a sequence having greater than 60% amino acid identity with said C-terminal seven cysteine domain of human OP-1.
 25. The method of claim 1, 9, 10, 12 or 13 wherein the amino acid sequence of at least one of said morphogen polypeptides comprises a sequence defined by OPX, Seq. ID No.
 29. 26. The method of claim 1, 9, 10, 12 or 13 wherein the amino acid sequence of at least one of said morphogen polypeptides is identical to said C-terminal seven cysteine domain of human OP-1, or a conservative substitution variant thereof, provided that any said variant, when disposed in a mammalian tooth socket, induces periodontal tissue morphogenesis therein.
 27. The method of claim 1, 9, 10, 12 or 13 wherein said morphogen is solubilized by association with a morphogen prodomain polypeptide.
 28. The method of claim 1, 9, 10, 12 or 13 wherein said morphogen is obtained from culture medium of morphogen-secreting mammalian cells.
 29. The method of claim 28 wherein the amino acid sequence of at least one of said morphogen polypeptides comprises the pro form of human OP-1, residues 30-43 of Seq. ID No. 17, or a conservative substitution variant thereof, provided that any said variant, when disposed in a mammalian tooth socket, induces periodontal tissue morphogenesis therein.
 30. A composition comprising:(a) a morphogen comprising a dimeric protein that, when disposed in a mammalian tooth socket, induces morphogenesis of periodontal tissue, said dimeric protein comprising a pair of folded polypeptides, the amino acid sequence of each of which comprises(i) a sequence sharing at least 70% homology with the C-terminal seven cysteine domain of human OP-1, residues 38-139 of Seq. ID No. 5; or (ii) a sequence defined by Generic Sequence 6, Seq. ID No. 31, and (b) a cofactor that mitigates symptoms associated with periodontal tissue damage, the concentration of said morphogen in said composition being effective for inducing proliferation or differentiation of mammalian periodontal fibroblasts or cementoblasts.
 31. The composition of claim 30 wherein the concentration of said morphogen is effective for inducing regeneration of periodontal ligament or cementum.
 32. The composition of claim 30 wherein the concentration of said morphogen is effective for enhancing integration of an implanted tooth in a mammalian tooth socket.
 33. The composition of claim 30 wherein said cofactor is selected from an antibiotic, antiseptic, anesthetic, analgesic or a non-steroidal anti-inflammatory agent.
 34. The composition of claim 30 wherein said morphogen and said cofactor are dispersed in a biocompatible acellular matrix.
 35. The composition of claim wherein said matrix is derived from mammalian periodontal ligament or from demineralized mammalian bone or cementum.
 36. The composition of claim 30 comprising a viscous solution effective for maintaining a topically administered morphogen at a periodontal tissue locus.
 37. The composition of claim 30 wherein the amino acid sequence of each of said polypeptides comprises an approximately 102 amino acid sequence having cysteine residues at relative positions 1, 30, 34, 66, 67, 99 and 101 therein, wherein at least 70% of amino acid residues within said sequence are selected independently from residues occupying the corresponding positions within the sequence spanning residues 38-139 of Seq. ID No. 5, and conservative substitutions of said residues.
 38. The composition of claim 37 wherein said approximately 102 amino acid sequence has at least 101 amino acids.
 39. The composition of claim 37 wherein said approximately 102 amino acid sequence has at most 106 amino acids.
 40. The composition of claim 30 wherein the amino acid sequences of said morphogen polypeptides comprise a sequence sharing at least 80% homology with said C-terminal seven cysteine domain of human OP-1.
 41. The composition of claim 30 wherein the amino acid sequences of said polypeptides comprise a sequence having greater than 60% amino acid identity with said C-terminal seven cysteine domain of human OP-1.
 42. The composition of claim 41 whereto the amino acid sequences of said polypeptides comprise a sequence having greater than 65% amino acid identity with said C-terminal seven cysteine domain of human OP-1.
 43. The composition of claim 30 wherein the amino acid sequences of said polypeptides comprise a sequence defined by OPX, Seq. ID No.
 29. 44. The composition of claim 30 wherein the amino acid sequence of at least one of said morphogen polypeptides is identical to said C-terminal seven cysteine domain of human OP-1, or a conservative substitution variant thereof, provided that any said variant, when disposed in a mammalian tooth socket, induces periodontal tissue morphogenesis therein.
 45. The composition of claim 30 wherein said morphogen is solubilized by association with a morphogen prodomain polypeptide.
 46. The composition of claim 30 wherein said morphogen is obtained from culture medium of morphogen-secreting mammalian cells.
 47. The composition of claim 30 wherein the amino acid sequence of at least one of said morphogen polypeptides comprises the pro form of human OP-1, residues 30-431 of Seq. ID No. 17, or a conservative substitution variant thereof, provided that any said variant, when disposed in a mammalian tooth socket, induces periodontal tissue morphogenesis therein.
 48. A prosthetic tooth for implantation in a mammalian tooth socket, the exterior root surface of said tooth having a morphogen adsorbed thereon, said morphogen comprising a dimeric protein comprising a pair of folded polypeptides, the amino acid sequence of each of which comprises(i) a sequence sharing at least 70% homology with the C-terminal seven cysteine domain of human OP-1, residues 38-139 of Seq. ID No. 5; or (ii) a sequence defined by Generic Sequence 6, Seq. ID No. 31,further wherein, when disposed in a mammalian tooth socket, said dimeric protein induces morphogenesis of periodontal tissue.
 49. The prosthetic tooth of claim 48, prepared by absorption of said morphogen onto an exterior root surface of a naturally-derived allogenic or autologous tooth.
 50. The prosthetic tooth of claim 49, prepared by exposing the exterior root surface of said tooth to demineralizing conditions, prior to absorbing said morphogen thereon.
 51. The prosthetic tooth of claim 48, prepared by replacing the root of a naturally-derived allogenic or autologous tooth with a biologically inert synthetic root.
 52. The prosthetic tooth of claim 51 wherein said biologically inert synthetic root comprises collagen, ceramic or metal.
 53. The prosthetic tooth of claim 48, prepared by adsorption of said morphogen onto the exterior root surface of a synthetic tooth.
 54. The prosthetic tooth of claim 53 wherein said synthetic tooth comprises collagen, ceramic or metal. 